feat: add Captor matcher for argument inspection#301
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Captor[T] is a generic Matcher that records arguments passed to a mocked method so tests can inspect them after the run, without writing a Do callback that mirrors the full method signature. Wrong-type values do not match and are not recorded, so it composes with AnyOf and similar matchers. Captures are guarded by a mutex for use with mock calls from multiple goroutines.
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Implementation for #300.
Open for design discussion on the issue first; this PR provides a concrete reference. Will mark ready for review once the issue gets ack.
cc @sywhang @r-hang @abhinav