Input integration: Google Drive

[ivanpetrushev]

We need to be able to fetch meeting recordings from Google Drive folders. This plugin should fetch audio/video files and upload them to our input S3 bucket.

Notes:

• periodical check for new files
• when new files found, "process" them via PutObject to the input S3 bucket
• Lambda has limited ephemeral storage - default 512MB might need an increase, if we pull video files from Drive
• initial run should: a) import all existing files or b) mark all existing files as already processed
• Google server-side flow: https://developers.google.com/identity/sign-in/web/server-side-flow
• server-side flow still uses a client part, maybe use Lambda function URLs (no auth)
• server-side flow error catching - notify SNS for connectivity issues
• some form of routing - map input S3 bucket keys to different Google Drive folders