fix(arrow/flight/session): clone option values - #1044
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What changed
Clone mutable Flight session option protobufs when storing and retrieving individual option values.
Why
The stateful session implementation previously stored caller-owned pointers and returned its internal pointers after releasing the mutex. Callers could therefore mutate session state outside synchronization, despite the implementation's goroutine-safety contract.
The regression test covers both aliasing directions: modifying the input after
SetSessionOptionand modifying the value returned byGetSessionOption.Validation
go test ./arrow/flight/sessiongo test -race ./arrow/flight/session