Create new endpoint to return pipeline vers. for specific pipeline name for query tool

[rmanaem]

• Has endpoint /pipelines that returns available pipeline names
• Has endpoint /pipelines/{pipeline_term}/versions that takes a pipeline name as a path parameter and returns the available versions
• Responds with a dictionary like {"PipelineName": ["version1", "version2"]}

Example request:

http://node-api.org/pipelines/np:fmriprep/versions

Example response:

{"np:fmriprep": ["23.1.3", "20.2.7"]}

Related to:

• [ENH] Add /pipelines router & route for fetching available pipeline versions api#350
  Blocked by:
• Refactor generic /attributes router into attribute-specific routers api#354

[neurobagel-bot]

🚀 Issue was released in v0.4.0 🚀