[converter/core] feature: Prepare Camunda 8.2

[jonathanlukas]

Description

As Camunda 8.2 will cover more BPMN elements, we need to adjust our ruleset to fit the progress.

This PR will cover the following changes:

• Support Task
• Support Escalation
• Support Error Codes as expressions
• Support Link Events
• Support embedded feel scripts in Script Tasks
• Support Signal Start Events

Additional context

Closes #166

Testing your changes

Every change is tested in 2 ways: Old version behaviour, new version behaviour.

Types of changes

• Bug fix (non-breaking change which fixes an existing open issue)
• New feature (non-breaking change which adds functionality to an extension)
• Breaking change (fix or feature that would cause existing functionality of an extension to change)
• Documentation update (changes made to an existing piece of documentation)

Checklist:

• My code adheres to the syntax used by this extension.
• My pull request requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the Camunda Community Hub documentation.
• I have read the Pull Request Process documentation.
• I have added or suggested tests to cover my changes suggested in this pull request.
• All new and existing CI/CD tests passed.
• I will /assign myself this issue, and add the relevant [issue labels] to it if they are not automatically generated by Probot.
• I will tag @camunda-community-hub/devrel in a new comment on this issue if 30 days have passed since my pull request was opened and I have not received a response from the extension's maintainer.

[jonathanlukas]

@ingorichtsmeier @shaarmann It's time for a review!

[github-actions]

Test Results

  25 files  +  25    25 suites  +25   2m 26s ⏱️ + 2m 26s
188 tests +188  188 ✔️ +188  0 💤 ±0  0 ❌ ±0 
304 runs  +304  304 ✔️ +304  0 💤 ±0  0 ❌ ±0 

Results for commit 6614af6. ± Comparison against base commit 67f6b7a.

♻️ This comment has been updated with latest results.