Adding RPC handler to touch files

[aryanjassal]

Description

This PR implements a RPC handler which touches files. Touching a file means that a file must be created if it doesn't exist, or update its access/modification timestamps to current time if it does.

Most likely Polykey#821 needs to be finished before this can be done.

Issues Fixed

• Relates to Polykey-CLI#244
• REF ENG-357

Tasks

• 1. Create a VaultsSecretsTouch RPC handler
• 2. Create files if they don't exist, update timestamps if they do
• 3. Add support for doing so for multiple vaults in a single commit
• 4. Add vaultOps.touchFile (or just do it manually in the handler)
• 5. Write tests for VaultsSecretsTouch
• 6. Write tests for vaultOps.touchFile (if it exists)

Final checklist

• Domain specific tests
• Full tests
• Updated inline-comment documentation
• Lint fixed
• Squash and rebased
• Sanity check the final build

[linear]

ENG-357 Implement `secrets touch` command