feat: rewrite extension

[azat-io]

Description

Do a complete refactoring of the extension to make it easier to maintain in the future.

Additional context

N/A.

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What is the purpose of this pull request?

• Bug fix
• New feature
• New icon support
• New theme support
• Documentation update
• Other

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• Check that there isn't already a PR that solves the problem the same way to avoid creating a duplicate.
• Provide a description in this PR that addresses what the PR is solving, or reference the issue that it solves (e.g. fixes #123).
• Ideally, include relevant tests that fail without this PR but pass with it.
• Read contribution guidelines.