[#898] Simplify some machinery using instances from `some`

I was agonizing way too long about whether to switch to Some in Address and SomeAlias. I didn't arrive to a conclusion. Long story short, it's more efficient (as it's a newtype under the hood), and semantically seems more correct than Constrained with a truthy constraint. But it needs more instances, both derived and manual, and working with it requires importing a bit of stuff from some, i.e. downstream packages have to add some to their dependencies.

Description

Problem: we can make use of the same machinery used by some, like GEq, GCompare, ArgDict, to get rid of some awkward boilerplate.

Solution: Do that.

Related issue(s)

Resolves #898 (closed)

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