chore(backend): introduce a filter ash policy

[lusergit]

What this PR does / why we need it:

Adds a new ash policy to filter (whatever entity) based on the list of ids OpenFGA provides when listing objects

They are meant to be used together to create policies to authorize users to do any activity inside of edgehog.

Additional documentation e.g. usage docs, diagrams, reviewer notes, etc.:

---

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[Dam-99]

some nits about typos, also in the second commit message