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xds: redesign client load recording and backend metrics receiving interface (#5903)

* Redefined StatsStore interface.
- Removed interface method StatsStore#interceptPickResult and implementation do not take the resposibility intercepting PickResult with locality-level load recording.
- Introduce a wrapper class for SubchannelPicker to let users wrap SubchannelPicker by themselves, with client side load recording logic.
- Associate the corresponding locality counter with child helper when it is created, child helper will intercept the SubchannelPicker it creates.

* Renamed backend metrics listener class to be more abstract, hides the implementation detail of doing locality-level aggregation.

* Integrate client load recording and backend metrics recording with xDS load balancer.

- Created LoadRecordingSubchannelPicker class for applying XdsClientLoadRecorder that records client load to PickResult.
- Created MetricsObservingSubchannel class for applying OrcaReportingTracerFactory that takes listener to receive ORCA reports to PickResult.
- In xDS load balancer LocalityStore, the original picker is wrapped two layers inside the above wrappers.

* Renamed XdsClientLoadRecorder to ClientLoadRecorder. It should only be used for testing, xDS load balancer should use SubchannelPicker wrappers instead of this load recorder directly.

* Removed redudent layer of wrapping for SubchannelPicker in LocalityStore

* Added toString for SubchannelPicker wrapper classes.

* Rename ClientLoadRecorder to LoadRecordingStreamTracerFactory.

* Renamed StreamInstrumentedSubchannelPicker to TracerWrappingSubchannelPicker.

* Eliminate duplicated code in LocalityStoreTest, put them into a loop.

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Source Files on job 14444.1