feature: add native execution engine

[varex83]

• implement full sierra contract class
• implement full native entrypoint execution
• add native syscall handler (without implemented members)

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 11.35029% with 453 lines in your changes are missing coverage. Please review.

Project coverage is 69.66%. Comparing base (1eb18ff) to head (71c2099).

Files	Patch %	Lines
...blockifier/src/execution/native/syscall_handler.rs	0.00%	192 Missing :warning:
crates/blockifier/src/execution/native/utils.rs	31.46%	122 Missing :warning:
...fier/src/execution/native/entry_point_execution.rs	0.00%	47 Missing :warning:
crates/blockifier/src/execution/contract_class.rs	0.00%	45 Missing :warning:
crates/blockifier/src/execution/execution_utils.rs	0.00%	27 Missing :warning:
crates/blockifier/src/transaction/objects.rs	0.00%	18 Missing :warning:
crates/blockifier/src/execution/call_info.rs	66.66%	0 Missing and 1 partial :warning:
...es/blockifier/src/transaction/transaction_utils.rs	0.00%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## feature/refactor-syscall-tests #74 +/- ## ================================================================== - Coverage 72.91% 69.66% -3.25% ================================================================== Files 72 75 +3 Lines 9141 9649 +508 Branches 9141 9649 +508 ================================================================== + Hits 6665 6722 +57 - Misses 2009 2460 +451 Partials 467 467 ```

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