PPVM-traits-2 Patch

[JonhasA]

A patch to move the changes to ppvm-trait from roger's PR #204

Additionally, the following changes were made:

1. Added arithmetic module for defining traits to numeric types
2. added gates module for defining traits for Clifford/ channel / measure/ rotation ops
3. container module now has additional files related to storage or engine configuration
4. Moved PREFER_MOVED_RKEY outside of coefficient and into storage.rs in containers/. Engine will configure the key rather than having coefficient module be responsible for it.
5. Added a LossState trait to be associated with word sites rather than having it in PauliBits.
6. Isolated functionality related to fermionic factors into fermion_factor.rs
7. Pauli type is used explicitly for rotation operations
8. Moves container tests beside their implementations and adds regression coverage for batch hash invalidation and Pauli-channel factors.
9. Moves pauli_error_factors into the optional PauliErrorFactors channel capability, preserving the generic default and numeric specializations.

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