feat: respect aliases in scriptlet exceptions

[seia-soto]

fixes #4058

TODO

• Add tests
• Add an ability to cache the normalised selector in somewhere
• Confirm the behavior in other abilities like "resource redirects"
• Update engine serialization version (as a last action)

[chrmod]

when looking over this PR I've realised modern scriptlets have more attributes to them. Specifically we should support: aliases, trusted flag, content script/page script flag.
All that, together with a fact we bundle scriptlet dependencies, may already by sufficient to update our approach and move scriptlets out of resources.txt to a separate subsystem.

Lets discuss

[seia-soto]

Closing with #4270