[DRAFT] Define Gobblin-on-TemporalWorkforcePlan and dynamic ScalingDirectives with parser

[phet]

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

• 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-XXX

Description

• Here are some details about my PR, including screenshots (if applicable):

Forthcoming...

Suggested sequence: begin with ScalingDirective, then WorkforcePlan (and WorkforcePlanTest), and next ScalingDirectiveParser (with ScalingDirectiveParserTest).

Tests

• My PR adds the following unit tests OR does not need testing for this extremely good reason:

Commits

• 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-commenter]

Codecov Report

Attention: Patch coverage is 79.49791% with 49 lines in your changes missing coverage. Please review.

Project coverage is 47.41%. Comparing base (45ad13e) to head (a974557).
Report is 17 commits behind head on master.

Files with missing lines	Patch %	Lines
...pache/gobblin/temporal/dynamic/ProfileOverlay.java	49.09%	22 Missing and 6 partials ⚠️
...he/gobblin/temporal/dynamic/WorkforceProfiles.java	66.66%	4 Missing and 2 partials ⚠️
...apache/gobblin/temporal/dynamic/WorkforcePlan.java	92.72%	4 Missing ⚠️
...he/gobblin/temporal/dynamic/WorkforceStaffing.java	90.90%	1 Missing and 2 partials ⚠️
...bblin/temporal/dynamic/ScalingDirectiveParser.java	95.45%	2 Missing ⚠️
...pache/gobblin/temporal/dynamic/StaffingDeltas.java	71.42%	2 Missing ⚠️
...emporal/cluster/GobblinTemporalClusterManager.java	0.00%	1 Missing ⚠️
...he/gobblin/temporal/dynamic/ProfileDerivation.java	91.66%	0 Missing and 1 partial ⚠️
...che/gobblin/temporal/dynamic/ScalingDirective.java	90.90%	0 Missing and 1 partial ⚠️
...apache/gobblin/temporal/dynamic/WorkerProfile.java	66.66%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #4068      +/-   ##
============================================
+ Coverage     45.12%   47.41%   +2.29%     
- Complexity     3199     8223    +5024     
============================================
  Files           705     1567     +862     
  Lines         26949    62111   +35162     
  Branches       2680     7053    +4373     
============================================
+ Hits          12160    29451   +17291     
- Misses        13781    29967   +16186     
- Partials       1008     2693    +1685     

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