Use libgrape-lite's pthash to replace BBHash

[vegetableysm]

Describe your problem

Currently, the perfect hash map used by the vertex map has problems with the string type. Replace BBHash with pthash to align with libgrape-lite.

[github-actions]

/cc @vegetableysm, this issus/pr has had no activity for for a long time, could you folks help to review the status ?
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    Thanks!