Fix RecursionError: Limit depth of nested Objects when generating fuzz parameters

[Chandra158]

Overview

...
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  File "/github/fuzz-lightyear/fuzz_lightyear/fuzzer.py", line 81, in _fuzz_parameter
    strategy = fuzz_fn(parameter, operation_id, required=required)  # type: ignore
  File "/github/fuzz-lightyear/fuzz_lightyear/fuzzer.py", line 178, in _fuzz_array
    elements=_fuzz_parameter(item, operation_id, required=required),
  File "/github/fuzz-lightyear/fuzz_lightyear/fuzzer.py", line 81, in _fuzz_parameter
    strategy = fuzz_fn(parameter, operation_id, required=required)  # type: ignore
  File "/github/fuzz-lightyear/fuzz_lightyear/fuzzer.py", line 213, in _fuzz_object
    if strategy:
...
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packages/hypothesis/strategies/_internal/lazy.py", line 139, in __repr__
    sig = signature(self.function)
  File "/usr/lib/python3.8/inspect.py", line 3105, in signature
    return Signature.from_callable(obj, follow_wrapped=follow_wrapped)
...
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  File "/usr/lib/python3.8/enum.py", line 339, in __call__
    return cls.__new__(cls, value)
RecursionError: maximum recursion depth exceeded while calling a Python object

• APPSEC-5131
• For self-referencing Objects, generating fuzz parameters results in a non-ending recursive call
• In this PR:
  • fixing the nested object depth to a max limit
  • this limit ( --depth) can be passed as an argument (default=6)