feat: upgrade manta-crypto abstractions for new circuits

[bhgomes]

• Upgrade Derived allocation mode to arbitrary type flags
• Split out the accumulator model trait into a Types trait
• Add ItemHashFunction for explicit "leaf hash" constructions for general accumulators (with ItemHashAccumulatorModel and ItemHashAccumulator wrappers)
• Move allocation of MembershipProof to Derived mode
• Add assert_equal to PartialEq to lift efficient assertion implementations to the AssertEq trait
• Add NonNative marker trait to allow distinguishing () from non-native compilers (this allows (): Has<T>)
• Add Zero and One traits
• Add more variable allocation and PartialEq implementations for compound types
• Add helper alias types for encryption
• Add CheckedAdd and CheckedSub traits to numeric utilities
• Add all_unequal utility function

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[BoyuanFeng]

Thanks for this great PR! Two minor comments:

[SupremoUGH]

Everything seems alright since the last review. Just one question to see if I understand correctly what's going on in the last commit. Is it that you are now required to explicitly mention the generic lifetime (even if you don't actually use it, hence the underscore) because of the new nightly released, and no actual change to the code happened?

[bhgomes]

@SupremoUGH Everything seems alright since the last review. Just one question to see if I understand correctly what's going on in the last commit. Is it that you are now required to explicitly mention the generic lifetime (even if you don't actually use it, hence the underscore) because of the new nightly released, and no actual change to the code happened?

Yeah, it seems the current version of nightly Rust requires explicit lifetimes in some places where it used to be implicit. Not sure why this change has been introduced though, but we had to patch it here.