fix: Add AIGuard endpoints, ZTW delete method, and replace flatdict dependency (#457)

[willguibr]

• Added Zscaler AI Guard policy detection endpoints (execute-policy, resolve-and-execute-policy)
• Added DELETE method for ZTW forwarding_rules resource
• Replaced flatdict dependency with internal flatten_dict/unflatten_dict helpers (fixes [BUG] Build fails with setuptools 82+ due to flatdict dependency using deprecated pkg_resources #454)
• Fixed flake8 F811 warning in zaiguard/legacy.py
• Fixed ZIA rule_labels VCR cassette to use scoped search
• Fixed ZIA sweep script ModuleNotFoundError
• Updated changelog and release notes

Co-authored-by: pankaj28843 pankaj28843@users.noreply.github.com Co-authored-by: enza252 enza252@users.noreply.github.com

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[codecov]

Codecov Report

❌ Patch coverage is 31.90184% with 222 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
zscaler/zaiguard/legacy.py	25.59%	125 Missing ⚠️
zscaler/zaiguard/policy_detection.py	17.54%	47 Missing ⚠️
zscaler/oneapi_client.py	21.42%	22 Missing ⚠️
zscaler/ztw/forwarding_rules.py	9.09%	10 Missing ⚠️
zscaler/oneapi_http_client.py	30.76%	9 Missing ⚠️
zscaler/config/config_validator.py	0.00%	4 Missing ⚠️
zscaler/request_executor.py	50.00%	3 Missing ⚠️
zscaler/zaiguard/zaiguard_service.py	75.00%	2 Missing ⚠️

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