feat: [PPT-2454] sanitize attributes

[chillfox]

...and fix ameba issues.

[naqvis]

I see we have introduced new attribute tag, but I don't see where is that handled and how that's going to handle. When we have introduced a tag, why do we need a separate before save hook? might be response to questions i have asked is buried under the linter noise.

[chillfox]

@naqvis The attribute tag is in spider-gazelle/active-model@cfa6cba. The before_save is for types that are not handled by the attribute tag, like: JSON::Any, Set(String), Array(String).

[chillfox]

I guess we should add Set(String) and Array(String) to https://github.com/spider-gazelle/active-model