adding RFC for transform

[thalurur]

Issue #, if available:
N/A

Description of changes:
Adding RFC for transform feature

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 #359 (e952ac2) into master (24382de) will decrease coverage by 0.22%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master     #359      +/-   ##
============================================
- Coverage     76.28%   76.06%   -0.23%     
  Complexity     1387     1387              
============================================
  Files           183      183              
  Lines          7022     7022              
  Branches       1143     1143              
============================================
- Hits           5357     5341      -16     
- Misses         1036     1053      +17     
+ Partials        629      628       -1     

Impacted Files	Coverage Δ	Complexity Δ
...statemanagement/model/destination/CustomWebhook.kt	65.21% <0.00%> (-28.99%)	12.00% <0.00%> (-2.00%)
...anagement/indexstatemanagement/model/Transition.kt	64.61% <0.00%> (+1.53%)	5.00% <0.00%> (ø%)
...nt/indexstatemanagement/model/destination/Chime.kt	54.54% <0.00%> (+13.63%)	4.00% <0.00%> (+2.00%)

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