Cip 67 & 68 Support (continued from #297)

[SamDelaney]

This builds on the work done in #297 by @theeldermillenial and @Cat-Treat in hopes of closing it out. Happy to have it pulled into that PR if preferred, I just want to confirm the builds pass here.

Changes that are specific to this PR:

• Merged w/ main

• Add crc8 >=v0.1.0 to (confirmed works w/ 0.1.0, 0.2.0, 0.2.1)

• Fix IndefiniteList initialization crash when wrapping IndefiniteFrozenList

IndefiniteList.__init__ would raise AttributeError: 'IndefiniteFrozenList' object has no attribute 'data' when passed an IndefiniteFrozenList. UserList.__init__ detects it as a UserList instance and tries to copy via .data[:], but IndefiniteFrozenList inherits from FrozenList (a C-extension list subclass) which stores items in the list itself, not in a .data attribute.

The fix converts FrozenList inputs to a plain list before delegating to UserList.__init__. This surfaces in CIP-68 datum round-trip serialization, where the CBOR decoder produces an IndefiniteFrozenList that is then wrapped in a new IndefiniteList during to_shallow_primitive.

[SamDelaney]

Closing in favor of theeldermillenial#4