Specialize TfHashAppend for std::vector<bool>

[nvmkuruc]

Description of Change(s)

The TfHashAppend specialization for std::vector uses the .data() method to hash contiguous elements. However, std::vector<bool> is not guaranteed to provide a .data() method and does not guarantee the underlying data's length is the container's size() * sizeof(bool).

This change modifies the TfHashAppend specialization to not match against std::vector<bool> and provides a more explicit specialization that uses std::hash instead.

This issue was detected during testing of #2176 which changes VtHash to prefer TfHash over hash_value for hashing.

Fixes Issue(s)

• Prefer TfHash to boost::hash #2172

• I have verified that all unit tests pass with the proposed changes

• I have submitted a signed Contributor License Agreement

[tallytalwar]

Filed as internal issue #USD-8039