r25826 - Refactor AbstractCommand: avoid raw types (fia/pull/170']#170) * refactor: avoid raw arraylist

[Github Bot]

Refactor AbstractCommand: avoid raw types (#170)

* refactor: avoid raw arraylist in abstract command

* refactor: while we're here, generify PrefixMap

* refactor: provide function for registering commands; use in tests

* Fix Typo

* tests: move cleanup to ClearSharedState

Co-authored-by: jaadams5 <82782908+jaadams5@users.noreply.github.com>

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