roryqi opened a new pull request, #12143:
URL: https://github.com/apache/gravitino/pull/12143

   ### What changes were proposed in this pull request?
   
   Implement tag assignment values:
   - Add `TagValuePair` and change tag association requests to use tag-value 
pair arrays.
   - Add `allowedValues` to tag creation and detailed tag DTOs.
   - Store assignment values in `tag_relation_meta.tag_value` with 
`value_order`.
   - Return assignment values in detailed tag responses for metadata objects.
   - Add exact value lookup through `GET /tags/{tag}/objects?value=...`.
   - Make repeated assignment idempotent and keep `allowedValues` immutable 
after creation.
   
   ### Why are the changes needed?
   
   Current tag assignment is boolean and cannot represent values such as 
`data_domain=finance` without creating one tag per value.
   
   Fix: #12127
   
   ### Does this PR introduce _any_ user-facing change?
   
   Yes. Tag create requests and tag DTOs can include `allowedValues`; tag 
association requests now support `tagsToAdd` / `tagsToRemove` as tag-value 
pairs; object lookup for a tag supports the optional `value` query parameter.
   
   ### How was this patch tested?
   
   - `./gradlew :api:test --tests org.apache.gravitino.tag.TestTagValuePair 
-PskipITs -PskipDockerTests=false`
   - `./gradlew :common:test --tests 
org.apache.gravitino.dto.requests.TestTagCreateRequest --tests 
org.apache.gravitino.dto.requests.TestTagsAssociateRequest --tests 
org.apache.gravitino.dto.tag.TestTagDTO :core:test --tests 
org.apache.gravitino.tag.TestTagManager --tests 
org.apache.gravitino.hook.TestTagHookDispatcher --tests 
org.apache.gravitino.listener.api.event.TestTagEvent -PskipITs 
-PskipDockerTests=false`


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