WELD-2774 Implement BM methods for event/bean assignability

[manovotn]

The PR is going to fail CI until we get a CDI API release and ideally a TCK release to have tests.

There are no Weld specific tests for this as Weld doesn't add anything beyond what's in the TCK coverage via jakartaee/cdi-tck#526

[manovotn]

I've added some validations:

• Qualifier validation for all inputs (if the annotation is a CDI qualifier)
• Event type validation for unresolved type variable
• Filtering of provided bean types for legal bean types only

These are so far not covered by the linked TCK test.
If they won't be covered, I'll add Weld test cases.

[manovotn]

Superseeded by #2911