fix(unified-search): handle slow server search for loader spinner

[alperozturk96]

Issue

In slow server instance spinner always showed and files are loading in main thread.

Changes

Loading spinner has max ceiling value
Loads the file in IO thread
Bind function directly takes OCFile thus no need for each bind database operation

[github-actions]

APK file: https://github.com/nextcloud/android/actions/runs/31708377060/artifacts/9185933527
To test this change/fix you can simply download above APK file and install and test it in parallel to your existing Nextcloud app.
(please click on link to get QR code displayed)

[github-actions]

APK file: https://github.com/nextcloud/android/actions/runs/32112686853/artifacts/9315869222
To test this change/fix you can simply download above APK file and install and test it in parallel to your existing Nextcloud app.
(please click on link to get QR code displayed)

[github-actions]

APK file: https://github.com/nextcloud/android/actions/runs/32114634969/artifacts/9316393935
To test this change/fix you can simply download above APK file and install and test it in parallel to your existing Nextcloud app.
(please click on link to get QR code displayed)

[github-actions]

Codacy

SpotBugs

Category	Base	New
Bad practice	32	32
Correctness	59	59
Dodgy code	207	207
Experimental	1	1
Malicious code vulnerability	2	2
Multithreaded correctness	25	25
Performance	39	39
Security	19	19
Total	384	384

[github-actions]

blue-Light-Screenshot test failed, but no output was generated. Maybe a preliminary stage failed.

[github-actions]

APK file: https://github.com/nextcloud/android/actions/runs/32115440530/artifacts/9316888528
To test this change/fix you can simply download above APK file and install and test it in parallel to your existing Nextcloud app.
(please click on link to get QR code displayed)

[daniele-verducci]

It seems good to me. I'm not sure how to simulate a slow server, so I tested throttling down the connection and the search part works as intended on timeout. Also checked with an encrypted folder and the more button is correctly hidden.