feat: add inline YARA rules support

[Pouyanpi]

PR Description by GH Copilot

This pull request refactors and enhances the injection detection module by improving configuration validation, supporting inline YARA rules, and adding new tests. The changes aim to make the code more modular, robust, and easier to extend.

Refactoring and Validation Improvements:

• Renamed _validate_unpack_config to validate_injection_config and updated it to focus solely on validating the configuration without unpacking values. [1] [2]
• Introduced extract_injection_config to handle the extraction and processing of configuration values, separating concerns for better modularity.
• Enhanced validation logic for action_option and yara_path to ensure stricter checks and clearer error messages. [1] [2]

Support for Inline YARA Rules:

• Added support for defining YARA rules inline via a new yara_rules dictionary in the configuration. This allows rules to be loaded directly from strings instead of files. [1] [2]
• Updated the load_rules function to handle both file-based and inline rule sources.

Test Suite Enhancements:

• Updated existing tests to use the new validate_injection_config and extract_injection_config functions. [1] [2]
• Added a new test, test_load_inline_yara_rules, to validate the functionality of inline YARA rules.

Other Changes:

• Made yara_path optional in the InjectionDetection configuration and added the new yara_rules field.
• Updated imports and removed unused _validate_unpack_config references across the codebase.

[Pouyanpi]

should be merged after #1162

[erickgalinkin]

Looks good to me, thanks!

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 91.42857% with 3 lines in your changes missing coverage. Please review.

Project coverage is 68.03%. Comparing base (6d55b82) to head (037795c).

Files with missing lines	Patch %	Lines
...oguardrails/library/injection_detection/actions.py	90.90%	3 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1164      +/-   ##
===========================================
+ Coverage    68.00%   68.03%   +0.02%     
===========================================
  Files          161      161              
  Lines        15801    15813      +12     
===========================================
+ Hits         10746    10758      +12     
  Misses        5055     5055              

Flag	Coverage Δ
python	68.03% <91.42%> (+0.02%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
nemoguardrails/rails/llm/config.py	89.63% <100.00%> (+0.01%)	⬆️
...oguardrails/library/injection_detection/actions.py	80.16% <90.90%> (+1.98%)	⬆️

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[trebedea]

LGTM.