OBI java agent

[grcevski]

This PR adds the OBI Java agent for instrumenting TLS for Java applications. It's a follow-up to #891, that is, the Step 1 of the follow-ups.

Follow-up work required:

• Build process, packaging and CI
• Enable the injection from OBI's code

The contributed README.md contains all of the details on how to get started and how this agent is structured and organised.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 55.14%. Comparing base (c382c78) to head (6c9d5e7).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #896   +/-   ##
=======================================
  Coverage   55.14%   55.14%           
=======================================
  Files         253      253           
  Lines       21716    21716           
=======================================
  Hits        11975    11975           
  Misses       8917     8917           
  Partials      824      824           

Flag	Coverage Δ
integration-test	23.24% <ø> (-0.05%)	⬇️
integration-test-arm	0.00% <ø> (?)
integration-test-vm-${ARCH}-${KERNEL_VERSION}	?
k8s-integration-test	2.73% <ø> (ø)
oats-test	0.00% <ø> (ø)
unittests	46.25% <ø> (ø)

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[skl]

Nice tests!