feat(matches): add explicitRole, implicitRole, and semanticRole matches functions

[straker]

Specific matches functions are needed to know when to look at just the explicit role, just the implicit role, or the semantic role. This follows the ACT standard of naming.

Note: getting the role matches to work with SerialVirtualNode will require a rewrite of getRole to use the virtual node to access the role attribute, which will require ensuring every test that uses getRole at any point to set up the virtual tree, which is a lot of tests. That will be its own pr after #2281 is merged.

Also cleaned up the imports while I was in the code.

Closes issue: #1349

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