fix: parse named function arguments

[Seddryck]

Summary

• accept named function arguments using parameter-name := value
• preserve named arguments as lossless named_argument / NamedArgumentSyntax nodes
• bind named and positional arguments in authored order while retaining .name as RecordAccessSyntax
• add corpus and managed binding coverage for the reported expression, mixed arguments, and malformed input

Root cause

The function-call grammar restricted argument_list to positional_argument nodes, so valid named arguments could not be represented or bound.

Validation

• npx tree-sitter generate
• npx tree-sitter test — new named and mixed argument cases pass; 124/130 overall, with the remaining six existing snapshots differing only because the Windows checkout uses CRLF (\r versus \n and CST line rendering)
• dotnet test bindings/csharp/Expressif.Syntax.Tests/Expressif.Syntax.Tests.csproj --no-restore --nologo — 82/82 passed on each of .NET 8, .NET 9, and .NET 10

Close #60

[coderabbitai]

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Run ID: 72fc1618-6244-4d61-baaa-3774239f5842

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