[PR] fix(driver/databricks): serialize pool init to prevent OAuth port race [arrow-adbc]

[via GitHub]

jasonlin45 opened a new pull request, #4401:
URL: https://github.com/apache/arrow-adbc/pull/4401

   ## Summary
   - Add mutex to `databaseImpl` to serialize `Open()`/`Close()`/`SetOption()` 
   - Concurrent `Open()` calls no longer race on pool init (duplicate OAuth 
listeners on port 8020)
   - Extract `getOrCreatePool()` helper; nil-guard `Close()`
   
   Fixes dbt-labs/dbt-core#13387
   
   ## Test plan
   - [x] `go test -race -run TestConcurrent -count=5` passes
   - [x] `go build` clean
   
   🤖 Generated with [Claude Code](https://claude.com/claude-code)


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