Support JDBC spans for Druid-wrapped Oracle statements

[lrwh]

Description
This PR fixes missing business SQL spans for Oracle JDBC when the application uses Druid connection wrappers.

Changes in this PR:

• add Druid wrapped connection and prepared statement classes to JDBC instrumentation matching
• prevent duplicate prepared statement spans by adding call-depth protection
• add a regression test covering Druid-wrapped prepared statement tracing

Result:

• business Oracle SQL executed through Druid/MyBatis can now produce JDBC prepared statement spans correctly

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