Migrate photo storage to GCloud storage

[vnugent]

Issues:

• Store photos in another cloud storage to reduce operating cost open-tacos#791 (Frontend)
• Pictures from parent area get shown in child open-tacos#748 (Frontend)
• Store photo metadata in DB #271
• Resolving User fields within the GQL schema #202
• Introduce a new AuthorMetada object #280
• Introduce a new MediaWithTags object #282
• Climb createdBy and createdAt not set #218

TBD in a follow up PR:

• Migrate Tag CRUD to new data model #281

Migration steps (I'll test this in staging first)

• Turn off photo uploading & tagging in production
• Back up production db
• Download all production photos locally
• Run Create media object collection job to create the new MediaObjects collection
• Run Migrate tags to MediaObjects job
• Upload all photos to Google storage
• Deploy new build to production (this PR)
• Merge frontend PR chore: resolve photo metadata from backend open-tacos#800
• Follow up PR Migrate Tag CRUD to new data model #281

---

New data model

1. Media object collection is a 1-1 mapping with objects on GCloud bucket
2. rawTags is an embedded array of Tags eliminating the need to do a lookup (SQL join)
3. Still need to join raw tags with both Climbs and Areas collection to get the tagged climb/area name

[vnugent]

@zichongkao @musoke @CocoisBuggy
I wanted you to be aware of the new data model for media & tags. This is a large PR because media & tags touch a lot of the code. I decide to "rip the bandaid off" and simplify/unify multiple TS types of tags/media into one 'MediaWithTags'.

All frontend breaking changes are fixed in this PR: OpenBeta/open-tacos#800

[musoke]

This is a huge set of changes! Looks like a more sustainable base for the future 😃

[vnugent]

I did a dry-run import of production data locally and can confirm that existing tags were migrated to the new collection.

Tests: https://github.com/OpenBeta/openbeta-graphql/blob/f8ea4bfd9e514d97607b4135b7d6604b4c0408f4/src/db/utils/jobs/migration/Tests.ts

# node  build/db/utils/jobs/migration/Tests.js
...
{"level":30,"oldTagCount":619,"newTagCount":619,"result":"PASS","msg":"Old vs new tag count"}
{"level":30,"found":[],"result":"PASS","msg":"Orphane IDs check"}