[copybara-service]

Add PreferFormatMethod check for redundant String.format calls.

Callers of exceptions, precondition helpers, and builders that provide @FormatMethod overloads frequently wrap arguments in String.format(...) or "..." .formatted(...) and invoke the plain String overload instead. Pre-formatting the message is more verbose and prevents lazy formatting in APIs that only format on failure.

Add PreferFormatMethod (initially disabled by default in DISABLED_CHECKS pending evaluation) to detect and unwrap redundant String.format and String.formatted arguments when an accessible, unambiguous @FormatMethod overload exists on the target class or receiver hierarchy. The check supports both direct positional unwrapping ((..., String) → (..., @FormatString String, Object...)) and cause-first argument swapping ((String, Throwable) → (Throwable, @FormatString String, Object...)), while validating format strings via StrictFormatStringValidation and guarding against self-delegation and fixed-arity overload shadowing.