feat(fares-v2): add support for editing feeds with fares v2 data

[josh-willis-arcadis]

Checklist

• Appropriate branch selected (all PRs must first be merged to dev before they can be merged to master)
• Any modified or new methods or classes have helpful JSDoc and code is thoroughly commented
• The description lists all applicable issues this PR seeks to resolve
• The description lists any configuration setting(s) that differ from the default settings
• All tests and CI builds passing
• The description lists all relevant PRs included in this release (remove this if not merging to master)
• e2e tests are all passing (remove this if not merging to master)

Description

Adds support to the editor for feeds with fares v2 data.

Blocked by ibi-group/datatools-server#600.