[FEATURE] Fix checksum generation to use a gradle plugin instead of manually doing it in github actions

[harshavamsi]

Is your feature request related to a problem?

The current maven publishing system requires that we generate checksums for all files e.g xxx.pom.sha1 and xxx.pom.md5. This is currently being manually done before we publish in github actions . This should ideally be handled by a gradle plugin that generates these just before the distribution task is complete.

What solution would you like?

Using a plugin like https://github.com/gradle/gradle-checksum.

What alternatives have you considered?

None

Do you have any additional context?

None