Create commands for Toggling and Resetting inlayhints

[camiloaromero23]

I believe the title itself its very explanatory. I can take the time to create both commands but created the issue for asking about a couple of things:

1. Is it better if I create a file for the commands or can I create them in an already existing file (which one)?
2. Where can I require the existing changes if they are from a new file? In the init.lua?

[lvimuser]

Sorry, but I don't want commands.

The user may create them if necessary (and it's easier to do so than to remove); opt for exposing lua functions instead. I'll accept any PRs which implement and or improve whatever's missing.

See also #26.