[C++] [FlightSQL][ODBC]: Replace `ODBC` namespace with `namespace arrow::flight::sql::odbc`
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Component: C++
Component: FlightRPC
Type: enhancement
- Dominant language
- C++
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Description
### Describe the enhancement requested
- Replace `ODBC` namespace with `namespace arrow::flight::sql::odbc` in `odbc_impl`
Parent issue: https://github.com/apache/arrow/issues/30622
### Component(s)
C++, FlightRPC
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