Updating UnionFindLib to use uint64_t as its VertexID Type

[johnnyhchen]

UnionFindLib

types.h

• added needBossData struct as data container for unionFindLib::insertDataNeedBoss parameters
• redefined struct shortCircuitData to use

unionFindLib.h

• updated functions to use uint64_t for vertexIDs

unionFindLib.C

• updated functions to use uint64_t for vertexIDs

unionFindLib.ci

• updated functions to use uint64_t for vertexIDs

MISC commenting for documentation on core union find lib API functions.

Note: I have temporarily commented out the ANCHOR_ALGO since it has not been tested after we updated the interface to use uint64_t for vertexIDs, though it is an improvement over the old algorithm currently compiled by default.

[johnnyhchen]

@trquinn let me know what you think!