Controller restart implementation

[kmrdhruv]

controller restart handling initial implementation which handles restoring consumer nodes and in-progress operations.

[github-actions[bot]]

Test Results

275 tests   275 :white_check_mark:  58s :stopwatch:  55 suites    0 :zzz:  55 files      0 :x:

Results for commit 51e13fc3.

:recycle: This comment has been updated with latest results.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 4.41989% with 173 lines in your changes missing coverage. Please review.

Project coverage is 45.37%. Comparing base (78be60c) to head (663014f). Report is 19 commits behind head on master.

Files	Patch %	Lines
...radhi/verticles/controller/ControllerVerticle.java	0.00%	42 Missing :warning:
...pkart/varadhi/entities/cluster/ShardOperation.java	0.00%	26 Missing :warning:
...main/java/com/flipkart/varadhi/db/ZKMetaStore.java	0.00%	25 Missing :warning:
...aradhi/entities/cluster/SubscriptionOperation.java	0.00%	21 Missing :warning:
.../com/flipkart/varadhi/cluster/MessageExchange.java	30.76%	18 Missing :warning:
...main/java/com/flipkart/varadhi/db/OpStoreImpl.java	0.00%	12 Missing :warning:
.../com/flipkart/varadhi/consumer/ConsumerApiMgr.java	0.00%	9 Missing :warning:
...a/com/flipkart/varadhi/db/AssignmentStoreImpl.java	0.00%	7 Missing :warning:
...lipkart/varadhi/entities/cluster/ConsumerInfo.java	0.00%	6 Missing :warning:
...varadhi/verticles/controller/ControllerClient.java	0.00%	6 Missing :warning:
... and 1 more

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #156 +/- ## ============================================= - Coverage 63.11% 45.37% -17.74% - Complexity 543 610 +67 ============================================= Files 133 174 +41 Lines 2790 4145 +1355 Branches 168 261 +93 ============================================= + Hits 1761 1881 +120 - Misses 964 2184 +1220 - Partials 65 80 +15 ```

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