feat(engine): support standalone decision evaluation

[koevskinikola]

Description

Add support for standalone decision evaluation in the Zeebe process test library.

Related issues

closes #573

Definition of Done

Not all items need to be done depending on the issue and the pull request.

Code changes:

• The changes are backwards compatibility with previous versions
• If it fixes a bug then PRs are created to backport the fix

Testing:

• There are unit/integration tests that verify all acceptance criterias of the issue
• New tests are written to ensure backwards compatibility with further versions
• The behavior is tested manually

Documentation:

• Javadoc has been written
• The documentation is updated

[github-actions]

Test Results

  47 files  +  9    47 suites  +9   1m 57s ⏱️ +59s
116 tests +  6  116 ✔️ +  9  0 💤 ±0  0 ❌  - 3 
371 runs  +66  371 ✔️ +69  0 💤 ±0  0 ❌  - 3 

Results for commit 9b5301a. ± Comparison against base commit f01b7b6.

♻️ This comment has been updated with latest results.

[koevskinikola]

@Zelldon, I've created this PR in case you want to make progress more quickly on #620. The code will remove the error thrown by the missing evaluateDecision method.

So, if you would like to get unblocked, you can cherry-pick 43f8056.

Unfortunately, the PR is incomplete, as I can't add test coverage since the corresponding Java client PR is still in review (camunda/camunda#11048). And I would prefer if someone from the ZPA team reviews that PR.

[koevskinikola]

@remcowesterhoud, as the PR doesn't add any new assertions, I didn't make any changes to the documentation. Let me know if you think that the documentation should be updated in some way.

[remcowesterhoud]

LGTM 👍

bors merge

[ghost]

Build succeeded:

• Test summary