Allow remove from memPool

[shargon]

Description

Required for neo-project/neo-node#920 #4333

This pull request introduces a new method to the MemoryPool class in MemoryPool.cs that allows for the removal of a transaction by its hash in a thread-safe manner. This addition improves the ability to manage transactions within the memory pool by providing a way to safely remove and clean up associated data.

Transaction removal functionality:

• Added a new TryRemove method to the MemoryPool class, which attempts to remove a transaction by its hash and returns the transaction if found. This method ensures thread safety using a write lock and also cleans up related data structures and verification context.

Type of change

• Optimization (the change is only an optimization)
• Style (the change is only a code style for better maintenance or standard purpose)
• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

How Has This Been Tested?

• Unit Testing
• Run Application
• Local Computer Tests
• No Testing

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules