feat!: support class static blocks

[mdjermanovic]

This PR adds new "class-static-block" scopes. Each StaticBlock node creates a "class-static-block" scope.

https://github.com/tc39/proposal-class-static-block

Notes:

• Class static blocks are technically functions, so they have arguments. However, referencing those arguments is a parse-time error, so I didn't add those variables to class static block scopes because they have no observable effects. This is consistent with class field initializers, we didn't add arguments there either.
• Logic for properties that are deprecated per this document, such as Scope#isThisMaterialized, is not updated.
• An alternative to the new "class-static-block" type could be to use the existing "function" type, which might be more practical for some use cases, but also confusing for others. I think it's better to introduce a new scope type.

I tagged this as a breaking change as I'd like to suggest that we bump major version. While this is a new syntax for eslint-scope, parsers (including Espree) already support this syntax, and inserting a new scope where it didn't exist before looks like a relatively big change in scope analysis (from wrong to right, but still).

[nzakas]

LGTM. I agree that a major version bump makes sense.