Allow to set the trash bin size to a percentage value of the available disk space and to reset it to the default value

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Expected behavior

The new occ command (trashbin:size) should allow to set the size of the trash bin to a percentage value of the available disk space and also allow to reset the value to the default of 50%.

Current behavior

The new occ command (trashbin:size) has been introduced to configure the size of the trash bin. This currently only seems to allow to set the size to a fixed size and doesn't allow to set a percentage value of the available disk space, nor does it allow to reset the value to the default of 50% of the available disk space.

1. I haven't found a way to reset the parameter to the default value:
   > ./occ trashbin:size -1 => The "-1" option does not exist

2. I haven't found a way to configure a percentage value of the available disk space:
   > ./occ trashbin:size 10% => Failed to parse input size

Steps to reproduce

1. Open a command line session
2. Execute the given command and see what happens

Environment

Server Configuration

OS: Linux 4.9.218
Web server: Apache2 2.4.46
Database: MariaDB 10.2.24
PHP version: 7.4.8
Nextcloud version: 19.0.2

Client Configuration

Browser: Mozilla Firefox 80.0.1
Operating system: Windows 10

Start at the occ trashbin:size command entry point and trace how its fixed-size argument is parsed and stored. Check the existing trash-bin size behavior, then verify that percentage input and resetting to the 50% default work through the command; the payload names no files or tests.