Add bucketization for usage

[yojs]

Fixes #: #449

Description of changes: Adds a way to create bucket calculators based on rca.conf settings. So say we want to add configurable bucket sizes for old-gen, so you add a new object to rca.conf (all three), something like this:

{
...
"bucketization": {
    "old-gen": {
      "UNDER_UTILIZED": ..,
      "HEALTHY_WITH_BUFFER": ..,
      "HEALTHY": ..
    }
}
...

The bucketCalculator hangs off the RcaConf and Deciders have access to RcaConf object. So, in order to bucketize the value, all a decider has to do is

rcaConf.getBucketizationSettings("old-gen").compute(<current-value>)

Tests: Added unit tests.

If new tests are added, how long do the new ones take to complete

  Test testCreateBucketAssigner PASSED (3.3s)
  Test testMisSpelledTunableName PASSED
  Test testNoThresholds PASSED
  Test testNoBucketizationSettings PASSED

SUCCESS: Executed 4 tests in 6.9s

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[yojs]

Test nodeRoleChange FAILED (2s)

 429 tests completed, 1 failed
FAILURE: Executed 429 tests in 13m 41s (1 failed)

[vigyasharma]

No new comments from me, will wait for you to address @sruti1312's comments before approving.

[codecov]

Codecov Report

Merging #450 into master will increase coverage by 0.25%.
The diff coverage is 81.81%.

@@             Coverage Diff              @@
##             master     #450      +/-   ##
============================================
+ Coverage     72.00%   72.25%   +0.25%     
- Complexity     2630     2649      +19     
============================================
  Files           329      328       -1     
  Lines         14856    14902      +46     
  Branches       1238     1239       +1     
============================================
+ Hits          10697    10768      +71     
+ Misses         3758     3744      -14     
+ Partials        401      390      -11     

Impacted Files	Coverage Δ	Complexity Δ
...erformanceanalyzer/rca/framework/core/RcaConf.java	63.50% <77.77%> (+6.49%)	45.00 <7.00> (+7.00)
...rk/api/summaries/bucket/BasicBucketCalculator.java	95.00% <100.00%> (+1.66%)	9.00 <2.00> (+2.00)
...ceanalyzer/rca/framework/core/ConfJsonWrapper.java	94.87% <100.00%> (+0.27%)	21.00 <5.00> (+1.00)
...cisionmaker/actions/configs/CacheActionConfig.java	95.83% <0.00%> (-1.95%)	10.00% <0.00%> (+2.00%)	⬇️
...cisionmaker/actions/configs/QueueActionConfig.java	93.18% <0.00%> (-1.95%)	10.00% <0.00%> (+2.00%)	⬇️
...anceanalyzer/decisionmaker/deciders/Publisher.java	78.94% <0.00%> (-1.55%)	10.00% <0.00%> (-2.00%)
...nalyzer/decisionmaker/actions/CoolOffDetector.java
...yzer/rca/framework/api/summaries/ResourceUtil.java	98.50% <0.00%> (+0.32%)	4.00% <0.00%> (ø%)
...erformanceanalyzer/rca/scheduler/RCAScheduler.java	71.42% <0.00%> (+1.19%)	13.00% <0.00%> (+1.00%)
.../rca/store/rca/hotheap/HighHeapUsageOldGenRca.java	88.79% <0.00%> (+1.72%)	23.00% <0.00%> (+1.00%)
... and 12 more

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