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BET-411: handle migration of unlocked names (#77)

* chore: initial wip

* chore: more work on migration controller

* feat: basic unwrapped name migration without shadow entries

* refactor: first working version of unwrapped name migration

* refactor: fix contract size too high

* fix: e2e tests

* fix: hardhat tests

* refactor: merge migration and ejection controllers in l2

* refactor: make the base EAC roles usable elsewhere without inheriting the whole class

* refactor: switch to using verifiable factory

* refactor: remove old registry factory

* refactor: various improvements based on feedback

* feat: ensure only bridge controller can set token observer and/or subregistry for an ejected name

* refactor: registry roles mixin is now a library

* feat: replace relinquish() with burn() and remove onReqlinquish() observer method

* Update contracts/src/common/EnhancedAccessControl.sol

Co-authored-by: Nick Johnson <arachnid@notdot.net>

* Update contracts/src/L2/L2BridgeController.sol

Co-authored-by: Nick Johnson <arachnid@notdot.net>

* refactor: replace onlyBridge modifier with roles

* refactor: simplify l2 bridge controller code

* docs: comment on how role checking works

* feat: helper method on registry to fetch assignee count

* Update contracts/src/L2/L2BridgeController.sol

Co-authored-by: Nick Johnson <arachnid@notdot.net>

* refactor: remove migration messages, simplify l1-to-l2 migration handling

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Co-authored-by: Nick Johnson <arachnid@notdot.net>

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