feat: Add file and folder selection functionality

[Francesco146]

all the managers have broken the "Select file path" and "Select folder path" when editing the patch options, also if you put a valid path there it throws a PathNotFoundException

i made this as draft because i still need to find the lowest permissions that make the feature work. right now i managed to patch by selecting the folder from the UI and get the right permissions to read all the needed files. things left to make:

• after the selection, the text box shows the path as a SAF content:// URL, this need to be changed with a /storage/emulated/0/... path (done in d475145)
• lower permissions as much as possible (done in da28ffd)

ref: flutter/flutter#40498 (comment)

[Francesco146]

i noticed that, I didn't have time to look deeply, so I removed the changes locally that were based on the modified patcher. glad you fixed that, I have in mind how to solve the first of the two still unsolved problems, tomorrow I'll do that :)

[Francesco146]

i'm fairly certain that, because of the various processes untied during the patching phase, the minimum level of permissions to access files is this

edit: i can't think of a better name for this PR, change it if you need to

[Francesco146]

it's worth adding that the permissions request should only be needed on Android 10+ (need other testing), so it could only be asked if the device is in that category

[Francesco146]

ready for review @inotia00 :)

[inotia00]

Thanks

[Francesco146]

Thanks to you as well

[Francesco146]

@inotia00 you reverted this in the latest version