Refactors files/classes to prepare for multiple features under the In…

[dbbaughe]

…dex Management suite

Issue #, if available:

Description of changes:

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

[codecov]

Codecov Report

Merging #285 into master will decrease coverage by 0.04%.
The diff coverage is 90.00%.

@@             Coverage Diff              @@
##             master     #285      +/-   ##
============================================
- Coverage     75.42%   75.37%   -0.05%     
+ Complexity      705      704       -1     
============================================
  Files            89       89              
  Lines          3914     3919       +5     
  Branches        627      625       -2     
============================================
+ Hits           2952     2954       +2     
- Misses          636      640       +4     
+ Partials        326      325       -1     

Impacted Files	Coverage Δ	Complexity Δ
...exmanagement/indexstatemanagement/action/Action.kt	100.00% <ø> (ø)	3.00 <0.00> (?)
...nt/indexstatemanagement/action/AllocationAction.kt	83.33% <ø> (ø)	2.00 <0.00> (?)
...agement/indexstatemanagement/action/CloseAction.kt	100.00% <ø> (ø)	3.00 <0.00> (?)
...gement/indexstatemanagement/action/DeleteAction.kt	0.00% <ø> (ø)	0.00 <0.00> (?)
...nt/indexstatemanagement/action/ForceMergeAction.kt	75.00% <ø> (ø)	5.00 <0.00> (?)
...indexstatemanagement/action/IndexPriorityAction.kt	83.33% <ø> (ø)	2.00 <0.00> (?)
.../indexstatemanagement/action/NotificationAction.kt	83.33% <ø> (ø)	2.00 <0.00> (?)
...nagement/indexstatemanagement/action/OpenAction.kt	100.00% <ø> (ø)	3.00 <0.00> (?)
...ment/indexstatemanagement/action/ReadOnlyAction.kt	100.00% <ø> (ø)	3.00 <0.00> (?)
...ent/indexstatemanagement/action/ReadWriteAction.kt	100.00% <ø> (ø)	3.00 <0.00> (?)
... and 81 more

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[dbbaughe]

As a note: Job Scheduler only lets us specify one job type which is why we changed this to be more generic for the whole plugin. At the same time it does not actually use this so it's not that important.