[Auto Suggest] DQL Updates (#7593)

Update to DQL Autocomplete: #7391

Every file removal under `grammar/.antlr` can be ignored.

- [x] use official value suggestion methods instead of direct api call
- [x] removed language specified configuration
- [ ]  ~~added memoization for value suggestion to reduce number of calls made~~
- [x] removed core start from query suggestion function
- [x] added tests for value suggestion
- [x] added more test coverage for other general cases
- [ ] ~~[[RFC] Monaco Code Editor provider registration #7594](#7594) made changes based on this RFC~~
- [x] remove grammar/.antlr auto generated files
- [x] updated types in code completion and related files
- [x] fixed many group value suggestion bugs and edge cases with more robust parser visitor
- [x] fix group value NOT suggestion bugs
- [ ] ~~added basic keyword syntax highlighting~~

---------

Signed-off-by: Paul Sebastian <paulstn@amazon.com>
Co-authored-by: opensearch-changeset-bot[bot] <154024398+opensearch-changeset-bot[bot]@users.noreply.github.com>

.gitignore

@@ -70,4 +70,5 @@ snapshots.js
 .yarn-local-mirror
 
 # Ignore the generated antlr files
-/src/plugins/data/public/antlr/opensearch_sql/grammar/.antlr
+/src/plugins/data/public/antlr/opensearch_sql/grammar/.antlr
+/src/plugins/data/public/antlr/dql/grammar/.antlr

changelogs/fragments/7593.yml

@@ -0,0 +1,2 @@
+fix:
+- Update DQL Autocomplete in code and functionality ([#7593](https://github.com/opensearch-project/OpenSearch-Dashboards/pull/7593))