feat: add library migration list endpoint [FC-0112]

[rpenido]

Description

This PR adds the /api/modulestore_migrator/v1/library/:libraryId/migrations/courses/ endpoint, which returns all course migrations for a target library.

• Which edX user roles will this change impact?
  "Developer"

Supporting information

• Related to: Import Home Page frontend-app-authoring#2523

Testing instructions

• Check feat: add course import page [FC-0112] frontend-app-authoring#2580

Deadline

"None"

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Private ref: FAL-4265

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[ChrisChV]

I think we need to return inProgress in any case other than Success and Failed; to match this type in the MFE

[rpenido]

Thanks @ChrisChV!
Fixed here: f1311d9

[navinkarkera]

@rpenido Nice work! 👍

• I tested this: (Tested api with the frontend)
• I read through the code
• I checked for accessibility issues
• Includes documentation