feat: confirmation dialog deleting keystore

[Mylloon]

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Type

Functionality

Issue

Missclicking the deletion of the keystores is easy and annoying

Feature

Add a confirmation dialog

Motivation

Prevent from missclick

Additional context

No response

Acknowledgements

• [X] I have searched the existing issues and this is a new and no duplicate or related to another open issue.
• [X] I have written a short but informative title.
• [X] I filled out all of the requested information in this issue properly.
• [X] The issue is related solely to the ReVanced Manager