Source Search not only just "All and Pinned"

[NeKoOuO]

Describe your suggested feature

The source search function should not only be divided into All and Pinned I hope to integrate categories and the search function and be able to choose which group to search.

Assuming that I have too many sources, causing each search to query a large number of sources, resulting in significant lag. I hope to be able to group these sources and only select one group for searching. Not just Pinned and All

Other details

This feature can reduce the amount of requests to the website and lighten the load on the sources. I comprehend the challenge, yet if accomplished, it would significantly augment convenience. From TachiyomiSY#959

Acknowledgements

• [X] I have searched the existing issues and this is a new ticket, NOT a duplicate or related to another open or closed issue.
• [X] I have written a short but informative title.
• [X] If this is an issue with an official extension, I should be opening an issue in the extensions repository.
• [X] I have updated the app to version 0.16.0.
• [X] I will fill out all of the requested information in this form.