rename getStateOrDefault to mustGetState

[chhsiao1981]

1. getStateOrDefault => mustGetState
2. getStateOrDefaultByThunk => mustGetStateByThunk
3. remove redundant type definition.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 88.88%. Comparing base (8f2b852) to head (bb00465).
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #166   +/-   ##
=======================================
  Coverage   88.88%   88.88%           
=======================================
  Files          15       15           
  Lines         189      189           
  Branches       29       29           
=======================================
  Hits          168      168           
  Misses         10       10           
  Partials       11       11           

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