Rename cdk to follow opensearch-project standards

[AndreKurait]

Description

Rename cdk to follow opensearch-project standards, a prereq to npmjs publishing. Also adds improvements like adding the License file to cdk submodule, adding a type declaration for InvokeCommandInput given observed build failures depending on cdk version, and updating the package.json to make the import work naturally when adding as a library.

• Category: Enhancement
• Why these changes are required? to publish to the opensearch-project npmjs org and use package as a library
• What is the old behavior before changes and new behavior after changes? name changes to package

Issues Resolved

N/A

Is this a backport? If so, please add backport PR # and/or commits #
N/A

Testing

npm run test

Check List

• [x ] New functionality includes testing
  • [ x] All tests pass, including unit test, integration test and doctest
• [x ] New functionality has been documented
• [ x] Commits are signed per the DCO using --signoff

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 76.88%. Comparing base (7eaf632) to head (37cac7c).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##               main     #529   +/-   ##
=========================================
  Coverage     76.88%   76.88%           
- Complexity     1386     1388    +2     
=========================================
  Files           158      158           
  Lines          6105     6105           
  Branches        532      532           
=========================================
  Hits           4694     4694           
- Misses         1059     1062    +3     
+ Partials        352      349    -3     

Flag	Coverage Δ
unittests	76.88% <ø> (ø)

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