[GOBBLIN-835] Date Converter

[ssnarvekar01]

Dear Gobblin maintainers,

Please accept this PR. I understand that it will not be reviewed until I have checked off all the steps below!

JIRA

• [x] My PR addresses the following Gobblin JIRA issues and references them in the PR title. For example, "[GOBBLIN-XXX] My Gobblin PR"
  • https://issues.apache.org/jira/browse/GOBBLIN-835

Description

• [x] Here are some details about my PR, including screenshots (if applicable): New feature which enables users to convert date field present in their inputRecord of jsonElement type from one format / timezone to another format / timezone.

Tests

• [x] My PR adds the following unit tests OR does not need testing for this extremely good reason: DateConverterTest tests the conversion done in DateConverter.

Commits

• [x] My commits all reference JIRA issues in their subject lines, and I have squashed multiple commits if they address the same issue. In addition, my commits follow the guidelines from "How to write a good git commit message":
  1. Subject is separated from body by a blank line
  2. Subject is limited to 50 characters
  3. Subject does not end with a period
  4. Subject uses the imperative mood ("add", not "adding")
  5. Body wraps at 72 characters
  6. Body explains "what" and "why", not "how"

[codecov-io]

Codecov Report

Merging #2704 into master will increase coverage by 0.2%. The diff coverage is 80.95%.

@@            Coverage Diff             @@
##             master   #2704     +/-   ##
==========================================
+ Coverage      44.9%   45.1%   +0.2%     
- Complexity     8713    8746     +33     
==========================================
  Files          1879    1880      +1     
  Lines         70079   70204    +125     
  Branches       7703    7709      +6     
==========================================
+ Hits          31466   31666    +200     
+ Misses        35702   35615     -87     
- Partials       2911    2923     +12

Impacted Files	Coverage Δ	Complexity Δ
...g/apache/gobblin/converter/date/DateConverter.java	80.95% <80.95%> (ø)	5 <5> (?)
...bblin/cluster/GobblinHelixJobLauncherListener.java	70% <0%> (-30%)	3% <0%> (-2%)
...in/java/org/apache/gobblin/cluster/HelixUtils.java	35.51% <0%> (-6.33%)	12% <0%> (-2%)
.../gobblin/cluster/HelixRetriggeringJobCallable.java	60.41% <0%> (-3.48%)	9% <0%> (ø)
...pache/gobblin/cluster/GobblinHelixJobLauncher.java	81.53% <0%> (-1.8%)	26% <0%> (-2%)
...ache/gobblin/cluster/GobblinHelixJobScheduler.java	39.21% <0%> (-1.31%)	6% <0%> (ø)
.../org/apache/gobblin/cluster/GobblinTaskRunner.java	64.78% <0%> (-0.94%)	29% <0%> (ø)
...in/service/modules/core/GobblinServiceManager.java	54.58% <0%> (-0.46%)	25% <0%> (ø)
...g/apache/gobblin/writer/PartitionedDataWriter.java	58.89% <0%> (-0.23%)	28% <0%> (+1%)
.../org/apache/gobblin/metrics/event/TimingEvent.java	70% <0%> (ø)	15% <0%> (ø)	:arrow_down:
... and 16 more

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