Finish all APIs using the connector for Spotify

[woolfg]

Connector Podcast (+send to API):

• [x] metadata (not time bound, alltime)
• [x] episodes (pagination -> fetch all episodes)
• [x] detailedStreams (3 days)
• [x] listeners (3 days) https://github.com/openpodcast/api/issues/20
• [x] aggregate (3x1 days (today, yesterday, the day before yesterday) as otherwise you get aggregated data of 3 days)
• [x] followers (3 days)

Connector Episode (+send to API):

• [x] detailedStreams (3 days) https://github.com/openpodcast/api/issues/18
• [x] listeners (3 days)
• [x] aggregate (3x1 days (today, yesterday, the day before yesterday) as otherwise you get aggregated data of 3 days)
• [x] performance (alltime)

API Podcast:

• [x] metadata https://github.com/openpodcast/api/pull/15
• [x] episodes
• [x] detailedStreams
• [x] listeners
• [x] aggregate https://github.com/openpodcast/api/pull/17
• [x] followers

API Episode:

• [x] detailedStreams
• [x] listeners
• [x] aggregate https://github.com/openpodcast/api/issues/14
• [x] performance

[woolfg]

detailedStreams in API in https://github.com/openpodcast/api/commit/f4294906b65725984f51a6141593972f93bb8e7d implemented

[mre]

Added the last remaining endpoint: followers. With that we're done here for now I think.