Types of changes

• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)

Proposed changes

Implement part of node-red/designs#77

• Adds "conf-types" to typedInput - permitting the Env Var UI editor to select a "config type"
• Adds getNodeDefinitions which is exposed via RED.nodes.registry.getNodeDefinitions
  • This is to support listing config types in a typedInput
• Exposes prepareConfigNodeSelect in RED.editor.prepareConfigNodeSelect to permit subflow env var to show config selection
• Modifies the ediatbleList to support "sortable, but not movable" items by adding a class red-ui-editableList-item-constrained to the li of the container
  • This is necessary for when a plugin (like dashboard) wants to show UI elements within a subflow in their editable list but dont want the user to be able to move items between groups

Demonstration

Checklist

• I have read the contribution guidelines
• For non-bugfix PRs, I have discussed this change on the forum/slack team.
• I have run npm run test to verify the unit tests pass
• I have added suitable unit tests to cover the new/changed functionality