Add support for PSV EntryFunctionName (#84409)

This change introduces a version 3 of the PSV data that includes support
for the name of the entry function as an offset into StringTable data to
a null-terminated utf-8 string.

Additional tests were added to ensure that the new value was properly
serialized/deserialized from object data.

Fixes #80175

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Co-authored-by: Cooper Partin <coopp@ntdev.microsoft.com>