fea: adding new PySherlock APIs Layer.list_layers and Layer.export_layer_image

[ansmedson-ext]

Description

Added APIs Layer.list_layers and Layer.export_layer_image.

Issue linked

New functionalities.

Checklist:

• Run unit tests and make sure they all pass
  - Run tests without Sherlock running
  - Run tests with Sherlock GRPC connection
• Check and fix style errors
  - pre-commit command line check
  - Problems tab in PyCharm
• Bench test new/modified APIs by using and modifying the code in the example for the API method
• Add new classes to rst files, located at: \doc\source\api
• Generate documentation
• Verify the HTML. It gets generated at: \doc\build\html.
  - Open index.html
  - Click on "API Reference" at the top.
  - Verify HTML for API changes.
• Check that test code coverage is at least 80% when Sherlock is running
• Make sure that the title of the pull request follows Commit naming conventions (e.g. feat: adding new PySherlock command)

[codecov]

Codecov Report

Attention: Patch coverage is 60.00000% with 30 lines in your changes missing coverage. Please review.

Project coverage is 60.22%. Comparing base (972b169) to head (0985151).

Files with missing lines	Patch %	Lines
src/ansys/sherlock/core/layer.py	53.84%	30 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #462      +/-   ##
==========================================
- Coverage   60.22%   60.22%   -0.01%     
==========================================
  Files          23       23              
  Lines        4983     5058      +75     
==========================================
+ Hits         3001     3046      +45     
- Misses       1982     2012      +30     

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