Refactor locking mechanism in WeakEventBase to use ReaderWriterLockSlim for improved concurrency

[Seramis]

Description

PR #3 fixes issues where appropriate locking was not acquired. All actions, both reading and writing, shared a single simple lock between them.

This PR improves the implementation to use ReaderWriterLockSlim so that multiple reader actions could run at the same time.

Related Issues

• Related to Clean up locking implementation in WeakEventHandlerBase #3

Type of Change

• Bug fix (non-breaking change that fixes an issue)
• New feature (non-breaking change that adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation update
• Other (please specify):

Checklist

• The PR is submitted to the correct branch (main).
• My code follows the project's coding style. (.editorconfig)
• I have commented my code, particularly in hard-to-understand areas and public interfaces.
• I have added or updated tests for the changes I made.
• All new and existing tests passed.
• I have updated the documentation where applicable.