wslact: improve memory-reclaim command

[kbpk]

Currently, there is incoherence in command naming between docs, and its help command.

In the docs of the wslact in the SYNOPSIS was wslact auto-mount.
In the help command, there is an alias memory-reclaim, which doesn't exist at the moment.

Also, it is possible to increase the amount of dropping cache by calling sync before.

Description

• in the docs, I changed mem-reclaim to memory-reclaim to keep coherence with the help command
• added memory-reclaim, keeping mem-reclaim as the alias
• wrote tests for memory-reclaim and mr, same as tests for other commands in the wslact
• fixed typo reclaimation -> reclamation
• added sync before dropping the cache

Types of changes

Breaking change (fix or feature that would cause existing functionality to not work as expected) are no longer accepted

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)

Checklist:

• I have read Code of Conduct and Contributing documentations.
• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.

[patrick330602]

LGTM