Add more metric in kyuubi server

[zhenjiaguo]

I want to add some metric in kyuubi server. This is listed in detail as follows:

1. Fetch rows rate. Use Meters to record the rows rate that fetch results and fetch logs.
2. BackendService method avg call times and rate. Replace Histograms with Timer to record it. Timer includes both Meters and Histograms.
3. Added metrics for all kyuubi server operations state change rate, include INITIALIZED, PENDING, RUNNING, etc. Use Meters to record it.
4. Improve the codahale metric registered in MetricsSystem. Add prefix to make metric more clear. Add ClassLoadingGaugeSet to help us more clear about JVM classloader info.
5. KyuubiSyncThriftClient wait locks thread count.
6. KyuubiSyncThriftClient each method call time metric. Use Timer to record it.
7. Active Kyuubi Server and Engine number. Implement by check the nodes registered on zookeeper and will use gauges to record it.

If there is any question, please let me know.

[zhenjiaguo]

@yaooqinn @ulysses-you

[yaooqinn]

SGTM