Fix mutex synchronization on GetNextChunk in FileDescription

[Yosif-Smint]

Brief Summary of Changes

Resolve synchronization issue due to different Thread releasing the mutex.
Using SemaphoreSlim for async locking

What does this PR address?

• GitHub issue (Add reference - #XX)
• Refactoring
• New feature
• Bug fix
• Adds more tests

Are tests included?

• Yes
• No

Reviewer, please note:

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I ran the full test suite before pushing the changes and all the tests pass.