* Implement spanName for MongoClientTracer
Adds a basic implementation for spanName in MongoClientTracer that uses the recommended name from the specification.
* Fix mongo4 tests
* Fix typo in test
* Handle missing dbName
* Update test with a command that has no collection as value
* Fix style issues
* Fix formatting
* remove uneeded line
* testing-common refactoring: replace direct AgentTestRunner usage with spock spec
* Updated instrumentation docs
* Fix reactor-core library tests
ReactorCoreTest was getting a tracer from GlobalOpenTelemetry before LibraryTestTrait had a change to initialize the SDK