feat: add in_app configuration for python SDK

[hpouillot]

Related: https://posthoghelp.zendesk.com/agent/tickets/45477

add in_app_modules config option

[greptile-apps]

Additional Comments (4)

1. posthog/__init__.py, line 213 (link)

   syntax: The type annotation Optional[list[str]] uses Python 3.9+ syntax. For backward compatibility with Python 3.8 and earlier versions, should use Optional[List[str]] from the typing module instead.

2. posthog/client.py, line 190 (link)

   syntax: The type annotation list[str] | None uses Python 3.10+ syntax. For backward compatibility, use Optional[List[str]] from the typing module instead.

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3. posthog/client.py, line 192-209 (link)

   style: Missing documentation for the new in_app_modules parameter in the docstring.

   Add documentation explaining what this parameter does and how to use it, consistent with other parameters like capture_exception_code_variables, code_variables_mask_patterns, and code_variables_ignore_patterns.

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4. posthog/__init__.py, line 213 (link)

   style: Missing documentation comment explaining what in_app_modules does. Other global configuration variables in this file have explanatory comments or docstrings (e.g., capture_exception_code_variables, code_variables_mask_patterns, code_variables_ignore_patterns).

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