Added framework to support metrics for bookkeeper

[jordanw-bq]

The new classes being added here only have a 2 space indent. We should match the indentation of the rest of the project (4 spaces)

[abhishekdas99]

We are planning to use 2 space indent. We have to go back and change the indent from 4 space to 2 space of the older files.

[shubhamtagra]

We should also write a script to get the collated view of these metrics across the cluster. Presto provides extracting jvm metrics from all nodes and show them in a single view which makes it easier to track these metrics, something similar for bookkeeper metrics would be really helpful

[coveralls]

Pull Request Test Coverage Report for Build 37

• 0 of 138 (0.0%) changed or added relevant lines in 8 files are covered.
• 2 unchanged lines in 2 files lost coverage.
• Overall coverage decreased (-1.6%) to 17.402%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
rubix-common/src/main/java/com/qubole/rubix/common/MetricsConstant.java	0	2	0.0%
rubix-common/src/main/java/com/qubole/rubix/common/MetricsReporting.java	0	3	0.0%
rubix-bookkeeper/src/main/java/com/qubole/rubix/bookkeeper/FileMetadata.java	0	6	0.0%
rubix-common/src/main/java/com/qubole/rubix/common/DummyMetrics.java	0	7	0.0%
rubix-bookkeeper/src/main/java/com/qubole/rubix/bookkeeper/BookKeeperServer.java	0	12	0.0%
rubix-bookkeeper/src/main/java/com/qubole/rubix/bookkeeper/BookKeeper.java	0	14	0.0%
rubix-common/src/main/java/com/qubole/rubix/common/MetricsFactory.java	0	14	0.0%
rubix-common/src/main/java/com/qubole/rubix/common/CodahaleMetrics.java	0	80	0.0%
<!--	Total:	0	138	0.0%	-->

Files with Coverage Reduction	New Missed Lines	%
rubix-bookkeeper/src/main/java/com/qubole/rubix/bookkeeper/BookKeeper.java	1	0.0%
rubix-bookkeeper/src/main/java/com/qubole/rubix/bookkeeper/BookKeeperServer.java	1	0.0%
<!--	Total:	2		-->

Totals
Change from base Build 36:	-1.6%
Covered Lines:	288
Relevant Lines:	1655

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💛 - Coveralls

[vrajat]

Superseded by a separate design.