Bump version for OpenSearch 1.2.0 release

[AMoo-Miki]

Signed-off-by: Miki [email protected]

Description

• Bumps plugin version to 1.2.0.0
• Bumps the OSD version to 1.2.0

Issues Resolved

Partly addresses #26

Check List

• New functionality includes testing.
  • All tests pass, including unit test, integration test and doctest
• New functionality has been documented.
  • New functionality has javadoc added
  • New functionality has user manual doc added
• Commits are signed per the DCO using --signoff

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.
For more information on following Developer Certificate of Origin and signing off your commits, please check here.

[codecov-commenter]

Codecov Report

Merging #36 (5c6055e) into main (3aa099e) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main      #36   +/-   ##
=======================================
  Coverage   95.30%   95.30%           
=======================================
  Files           5        5           
  Lines         149      149           
  Branches       45       45           
=======================================
  Hits          142      142           
  Misses          7        7           

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[joshuali925]

lgtm, thanks

[kavilla]

As soon as this merged then it can be added to the OpenSearch Dashboards manifest here:
https://github.com/opensearch-project/opensearch-build/blob/main/manifests/1.2.0/opensearch-dashboards-1.2.0.yml

Sooner better than later!

Thank you!