TLK-2364 - implements preamble extension for python interpreter tool

[EugeneLightsOn]

Interpreter Tool Improvements:

• Set forbidden packages.
• Add an additional preamble to prevent the use of forbidden packages in generated code.

AI Description

This pull request introduces a new feature to the Python interpreter tool, allowing for the specification of forbidden packages. This enhancement ensures that certain packages are not used during code generation, providing a more controlled and secure environment for code execution.

Summary of Changes:

• A new field, forbidden_packages, is added to the PythonToolSettings class in src/backend/config/settings.py. This field is an optional list of strings, and it defaults to a list of specific packages that are not allowed to be used in the Python interpreter tool.
• The BaseToolPreambleRegistry class in src/backend/tools/base.py is renamed to ToolDefaultPreambleRegistry.
• The preamble for the toolkit_python_interpreter tool is updated to include a list of forbidden packages.
• The get_preamble method in the ToolDefaultPreambleRegistry class is modified to retrieve the custom preamble for a given tool class, specifically for the toolkit_python_interpreter tool.
• The get_preamble and set_preamble class methods are added to the BaseTool class to manage the default preamble.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 53.33333% with 14 lines in your changes missing coverage. Please review.

Project coverage is 77.84%. Comparing base (6fc3a08) to head (50d9de9).

Files with missing lines	Patch %	Lines
src/backend/tools/base.py	51.72%	14 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #887      +/-   ##
==========================================
- Coverage   77.91%   77.84%   -0.08%     
==========================================
  Files         259      259              
  Lines       11150    11176      +26     
==========================================
+ Hits         8688     8700      +12     
- Misses       2462     2476      +14     

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