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[monitoring] Record the size of messages received and sent by the server (#823)

#### Type of change

- Improvement (improvement to code, performance, etc)
- Test update

#### Description

This PR includes the implementation of phaste two of #709  

- Add two method-labeled server histograms for received and sent message
wire sizes.
- Use each histogram's `_count` as the per-direction message counter,
including streaming throughput.
- Add shared size buckets from 8 B to 100 MiB, covering empty frames
through `connection.MaxMsgSize`.
- Route latency and stream-duration observations through
`promutil.Observe`.
- Extend the existing unit and full-system integration tests to cover
the new metrics.

#### Additional details (Optional)

Both directions are recorded only for messages gRPC actually completed:
`InPayload` fires
after a message decodes successfully, and `OutPayload` only once the
transport write
returns without error, so a malformed or undelivered message is not
observed.

#### Related issues

- resolves #709

Signed-off-by: Dean Amar <Dean.Amar@ibm.com>

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