bugfix: [adapter] Object variables in adapter

[jonathanlukas]

Description

Until now, it was not possible to use typed variables from the adapter delegateExecution as typing is not handled by the engine anymore.

This PR adds a mechanism to define typing rules for variables based on their names and the bpmnProcessId.

Additional context

closes #299

Testing your changes

For the tests, a rule has been registered and applied to the test delegate which can now handle the typed object.

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.

[github-actions]

Test Results

  24 files  ±0    24 suites  ±0   2m 0s ⏱️ +5s
212 tests ±0  212 ✔️ ±0  0 💤 ±0  0 ❌ ±0 
328 runs  ±0  328 ✔️ ±0  0 💤 ±0  0 ❌ ±0 

Results for commit e9c19ba. ± Comparison against base commit 2737310.