[Feature] Improve the conversion and comparison logic in IsEqualStateTrigger

[huoyaoyuan]

Describe the problem this feature would solve

Currently IsEqualStateTrigger can handle many cases, but code paths for them are not optimal.

Comparing two value types will fail with == which is ReferenceEquals, and fallback to conversion route.
Comparing enum with string will throw an exception, then successes with Convert.ChangeType to change enum to string.
Enum.IsDefined won't accept flags combinations.

Describe the solution

Refine the conversion and comparison logic.
Add unit test.

[ghost]

Hello, 'huoyaoyuan! Thanks for submitting a new feature request. I've automatically added a vote 👍 reaction to help get things started. Other community members can vote to help us prioritize this feature in the future!