Refactor: show/hide annotations by (un)muting instead of deleting

Description of change

• Refactored show/hide_sequences_annotations to (un)mute, it's much faster.
• Refactored show_sequences_annotations with add_overlay_to_sequence for consistency and reliability.

Closes #211 (closed)

How to test it

• Draw with different tool
• Show/Hide annotations

Checklist

Please check if your MR fulfills the following requirements:

• Unit tests have been added, if needed
• Documentation have been updated, if needed
• Build was run locally and any changes were pushed
• Lint has passed locally without error
• Package.py have been updated, if needed
• CHANGELOG.md have been updated, if needed
• Version numer has been tagged, if needed

FYI: @awesome_dev_too