Add feature to import snippets from other plugins

[imantsk]

Is your feature request related to a problem? Please describe

Currently, users cannot directly import snippets from other plugins, which limits the ease of transitioning to Code Snippets.

Describe the solution you'd like

Implement a feature that allows users to import code snippets from other WordPress plugins directly into Code Snippets.

Describe alternatives you've considered

Manually copying and pasting snippets from other plugins, which is time-consuming and prone to errors.

Additional context

This feature would greatly enhance the usability of Code Snippets for users transitioning from other plugins.