Make Camunda Connector Templates available

[philippfromme]

Proposed Changes

• adds enable-connector-templates flag
• fetches Camunda connector templates through marketplace if enabled through flag
• adds new connector templates, keeps existing
• adjusts element templates modal
  • removes legacy Cawemo terminology and support
  • adds support for grouping by category

Closes https://github.com/camunda/camunda-modeler/issues/4302

Success notification when connector templates fetched

Warning notification when error fetching some connector templates

Error notification when error fetching connector templates

Connector templates in replace popup

Connector templates in element templates modal

Checklist

To ensure you provided everything we need to look at your PR:

• [x] Brief textual description of the changes present
• [x] Visual demo attached
• [x] Steps to try out present, i.e. using the @bpmn-io/sr tool
• [x] Related issue linked via Closes {LINK_TO_ISSUE} or Related to {LINK_TO_ISSUE}

[nikku]

@philippfromme Let's link the issue you work on.

[philippfromme]

Connector templates are still available if the flag is disabled but was enabled before. I'll fix that.