crypto: optimize SubtleCrypto dispatch hot paths

[panva]

This improves several hot paths in Web Cryptography.

Deltas based on locally run benchmark.

Per-commit gains (each vs its parent)

crypto: optimize normalizeAlgorithm hot path

• Replace the O(n) case-insensitive for...in loop with an O(1) SafeMap lookup pre-built at module init.
• Hoist the { prefix, context } options object to module scope.
• Pre-compute ObjectKeys() for simpleAlgorithmDictionaries entries at module init.

op	before	after	Δ
normalizeAlgorithm-string	2.1 M op/s	3.8 M op/s	+79%
normalizeAlgorithm-dict	679 k op/s	912 k op/s	+34%

crypto: reduce allocations in WebIDL dictionary converter

• Replace SafeArrayIterator with an index-based loop in the inner function returned by createDictionaryConverter.
• Replace { __proto__: null, ...opts, context } with explicit property assignment when passing opts to member converters.

op	before	after	Δ
webidl-dict	1.58 M op/s	1.62 M op/s	+2.3%
webidl-dict-null	136 M op/s	219 M op/s	+61%

crypto: skip string tag allocation in AlgorithmIdentifier fast path

• Use a direct typeof check in converters.object and converters.AlgorithmIdentifier instead of the generic type() helper, which returned an intermediate 'Object' / 'Null' / ... string tag.

op	before	after	Δ
webidl-algorithm-identifier-string	195 M op/s	195 M op/s	neutral
webidl-algorithm-identifier-object	130 M op/s	278 M op/s	+114%

crypto: streamline WebIDL dictionary converter hot loop

• Classify V with typeof instead of type().
• Hoist opts.prefix/opts.context and allMembers.length out of the loop; initialize allMembers with direct index assignment.
• Drops the now-unused module-local type() helper.

op	before	after	Δ
webidl-dict	1.62 M op/s	1.65 M op/s	+1.6%
normalizeAlgorithm-dict	912 k op/s	936 k op/s	+2.7%
webidl-dict-enforce-range	1.04 M op/s	1.08 M op/s	+3.9%

crypto: reuse enforceRange option object for WebIDL integer members

• The inline [EnforceRange] unsigned short/long/octet wrappers spread the per-member opts object into a new one solely to set enforceRange: true. Replace the 18 inline wrappers with shared helpers that mutate the caller-supplied opts in place.

op	before	after	Δ
webidl-dict-enforce-range	1.08 M op/s	1.29 M op/s	+19.7%

Cumulative

op	baseline	final	Δ
normalizeAlgorithm-string	2.1 M op/s	3.8 M op/s	+79%
normalizeAlgorithm-dict	679 k op/s	936 k op/s	+38%
webidl-dict	1.58 M op/s	1.65 M op/s	+5%
webidl-dict-null	136 M op/s	211 M op/s	+55%
webidl-algorithm-identifier-string	197 M op/s	197 M op/s	neutral
webidl-algorithm-identifier-object	130 M op/s	278 M op/s	+114%
webidl-dict-enforce-range	1.05 M op/s	1.29 M op/s	+23%

A benchmark is added in the first commit (benchmark/crypto/webcrypto-webidl.js) covering normalizeAlgorithm, converters.AlgorithmIdentifier, createDictionaryConverter (with/without [EnforceRange] integer members and with a null/undefined required-member fast path), and converters.AeadParams.

[nodejs-github-bot]

Review requested:

• @nodejs/crypto

[codecov]

Codecov Report

❌ Patch coverage is 89.25620% with 13 lines in your changes missing coverage. Please review.
✅ Project coverage is 89.63%. Comparing base (14e16db) to head (06e2662).
⚠️ Report is 23 commits behind head on main.

Files with missing lines	Patch %	Lines
lib/internal/crypto/util.js	87.27%	6 Missing and 1 partial ⚠️
lib/internal/crypto/webidl.js	90.90%	5 Missing and 1 partial ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #62756   +/-   ##
=======================================
  Coverage   89.62%   89.63%           
=======================================
  Files         706      706           
  Lines      219136   219116   -20     
  Branches    41987    41956   -31     
=======================================
- Hits       196404   196394   -10     
+ Misses      14611    14608    -3     
+ Partials     8121     8114    -7     

Files with missing lines	Coverage Δ
lib/internal/crypto/webidl.js	98.33% <90.90%> (-0.05%)	⬇️
lib/internal/crypto/util.js	95.90% <87.27%> (+0.50%)	⬆️

... and 26 files with indirect coverage changes

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[panva]

Benchmark: https://ci.nodejs.org/view/Node.js%20benchmark/job/benchmark-node-micro-benchmarks/1831

                                                                             confidence improvement accuracy (*)    (**)   (***)
crypto/webcrypto-webidl.js n=1000000 op='normalizeAlgorithm-dict'                   ***     42.11 %       ±1.72%  ±2.30%  ±3.03%
crypto/webcrypto-webidl.js n=1000000 op='normalizeAlgorithm-string'                 ***     94.83 %       ±0.50%  ±0.66%  ±0.87%
crypto/webcrypto-webidl.js n=1000000 op='webidl-algorithm-identifier-object'        ***    157.00 %      ±11.28% ±15.18% ±20.09%
crypto/webcrypto-webidl.js n=1000000 op='webidl-algorithm-identifier-string'                -1.21 %       ±5.04%  ±6.71%  ±8.74%
crypto/webcrypto-webidl.js n=1000000 op='webidl-dict-enforce-range'                 ***     39.35 %       ±0.30%  ±0.40%  ±0.52%
crypto/webcrypto-webidl.js n=1000000 op='webidl-dict-ensure-sha'                    ***     14.60 %       ±0.54%  ±0.72%  ±0.94%
crypto/webcrypto-webidl.js n=1000000 op='webidl-dict-null'                          ***     98.06 %      ±14.30% ±19.12% ±25.08%
crypto/webcrypto-webidl.js n=1000000 op='webidl-dict'                               ***     13.92 %       ±1.83%  ±2.45%  ±3.23%

[nodejs-github-bot]

CI: https://ci.nodejs.org/job/node-test-pull-request/72825/