Remove git submodules in Java workflows

[richard-rogers]

Description

General Checklist

• Tests added for this feature/bug
  if it was a bug, test must cover it.
• Conform by the style guides, by using formatter
• Documentation updated
• (optional) Please add a label to your PR

[jamie256]

Let's update this to use the local proto definitions: https://github.com/whylabs/whylogs/tree/mainline/proto/src

Python already builds the proto definitions so no need to update that side of our build step or workflow.

The submodule approach is part of the previous factorization when the java package was separate from the python whylogs. Let's restructure this workflow to not depend on submodules. We can move the proto folder, but lets centralize the local definitions as the authority for message definitions in whylogs.

[richard-rogers]

Let's update this to use the local proto definitions

Looking at the sub-level build.gradle.kts, I think it's already setup to use the local proto stuff. I think it just depends on the Python build happening first to build proto.

I also bumped log4j in this PR to deal with the latest vulnerabilities.

[coveralls]

Pull Request Test Coverage Report for Build 1617747775

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 81.037%

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Totals
Change from base Build 1612988554:	0.0%
Covered Lines:	3881
Relevant Lines:	4662

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💛 - Coveralls

[jamie256]

LGTM