actionify add policy API

[bowenlan-amzn]

Issue #, if available:
#292

Description of changes:

actionify add policy API, refactor our API code so we have an action name to each API

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

[dbbaughe]

Do we actually need a subclass when there is nothing extra being added? Any reason not to just use ISMStatusResponse?

[bowenlan-amzn]

No big reason, just to look orderly, should be easier to read and understand I guess

[codecov]

Codecov Report

Merging #298 into master will increase coverage by 0.06%.
The diff coverage is 79.12%.

@@             Coverage Diff              @@
##             master     #298      +/-   ##
============================================
+ Coverage     74.88%   74.95%   +0.06%     
- Complexity      735      747      +12     
============================================
  Files           100      104       +4     
  Lines          4050     4076      +26     
  Branches        636      638       +2     
============================================
+ Hits           3033     3055      +22     
- Misses          687      688       +1     
- Partials        330      333       +3     

Impacted Files	Coverage Δ	Complexity Δ
...temanagement/transport/action/ISMStatusResponse.kt	93.33% <ø> (ø)	6.00 <0.00> (ø)
...ment/transport/action/addpolicy/AddPolicyAction.kt	66.66% <66.66%> (ø)	2.00 <2.00> (?)
...sport/action/addpolicy/TransportAddPolicyAction.kt	74.60% <74.60%> (ø)	2.00 <2.00> (?)
...ent/transport/action/addpolicy/AddPolicyRequest.kt	86.66% <86.66%> (ø)	6.00 <6.00> (?)
...ticsearch/indexmanagement/IndexManagementPlugin.kt	90.90% <100.00%> (+0.13%)	9.00 <0.00> (ø)
...statemanagement/resthandler/RestAddPolicyAction.kt	73.33% <100.00%> (-3.38%)	7.00 <0.00> (ø)
...nt/transport/action/addpolicy/AddPolicyResponse.kt	100.00% <100.00%> (ø)	2.00 <2.00> (?)
...action/removepolicy/TransportRemovePolicyAction.kt	73.58% <100.00%> (ø)	2.00 <0.00> (ø)
... and 3 more

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