release notes automation

[bowenlan-amzn]

Issue #, if available:

Description of changes:

1. add a workflow to track and add merged PR to a release draft, ready to publish

   • Prerequisite: label the PR! I have already created all possible related labels
   • Common labels are: feature, enhancement, version support, bug, testing, CI/CD, Refractor, documentation
   • you can check in workflow definition about which label will be categorized into which category

2. a python script to help generate the release notes under releases folder, use it like below:

   • copy down and save the release draft generated automatically by above workflow to some file, like note.md
   • run python create_release_notes.py, input the parameters it asks for, then you will have the formatted release notes which should be ready for your release PR

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 #258 into master will increase coverage by 0.02%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master     #258      +/-   ##
============================================
+ Coverage     71.32%   71.35%   +0.02%     
+ Complexity      635      634       -1     
============================================
  Files            86       86              
  Lines          3690     3690              
  Branches        610      610              
============================================
+ Hits           2632     2633       +1     
- Misses          737      738       +1     
+ Partials        321      319       -2     

Impacted Files	Coverage Δ	Complexity Δ
...dexstatemanagement/elasticapi/ElasticExtensions.kt	67.34% <0.00%> (-4.09%)	0.00% <0.00%> (ø%)
...ndexstatemanagement/IndexStateManagementHistory.kt	75.72% <0.00%> (-1.95%)	27.00% <0.00%> (-1.00%)
...ticsearch/indexstatemanagement/model/Transition.kt	82.35% <0.00%> (+9.80%)	5.00% <0.00%> (ø%)

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[ftianli-amzn]

A big step in unifying the release notes.

[bowenlan-amzn]

All the PRs merged after the last release will be included in the Draft release