Add chunker remote volume support

Pre-Submission checklist

[x] There is no existing issue that already asks for this feature.
[x] The feature already exists in rclone (on your PC or in Termux)
[ ] I am prepared to help make this feature

What version of RCX are you using (About -> App version)?

1.12.2

What problem are you trying to solve?

I'd like to access some rclone volumes I have that utilize the chunker remote. This remote system points to any other remote, but it adds the benefit of automatically breaking up files into multiple pieces if they are over a certain size.

For example, if a cloud provider has a max file size of 100mb, you can add that provider as remote "cloud_provider", then add a chunker remote to point to that cloud remote, and specify a max size of 100mb. This allows you to upload much larger files to the cloud remote, since the chunker remote seamlessly breaks up larger files into smaller chunks that are allowed on the cloud remote.

What should RCX be able to do differently to help with this problem?

Add support for this remote. The crypt remote is already there in the app, which does something similar (it isn't a remote in and of itself, merely wraps another remote with some of its own functionality). So adding chunker support would be great for Android as well, to be able to upload huge files to cloud providers with a small max file size.

x0b / rcx