MAINT: add codecov commenter bot

[chenqi0805]

Description

This PR

1. configured jacoco to generate xml report for codecov to identify
2. add codecov.yml config file
3. add codecov as an action in the github workflow
4. add codecov badge in project README

Issues Resolved

[List any issues this PR will resolve]

Check List

• New functionality includes testing.
  • All tests pass
• New functionality has been documented.
  • New functionality has javadoc 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.

[chenqi0805]

Blocking: We will need CODECOV_TOKEN to be added as secrets: https://app.codecov.io/gh/opensearch-project/data-prepper/

[codecov-commenter]

Codecov Report

❗ No coverage uploaded for pull request base (main@7479209). Click here to learn what that means.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #549   +/-   ##
=======================================
  Coverage        ?   92.60%           
  Complexity      ?      558           
=======================================
  Files           ?       68           
  Lines           ?     1676           
  Branches        ?      140           
=======================================
  Hits            ?     1552           
  Misses          ?       94           
  Partials        ?       30           

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[dlvenable]

This looks very nice!

Can we move the file codecov.yml file into the config/ directory? I'd like to try to avoid expanding our root directory.

[chenqi0805]

Can we move the file codecov.yml file into the config/ directory? I'd like to try to avoid expanding our root directory.

@dlvenable According to https://docs.codecov.com/docs/codecov-yaml#can-i-name-the-file-codecovyml, I have moved it to .github

[chenqi0805]

@dlvenable @jianghancn Thanks!