database migrations using Prisma Migration engines

[oscartbeaumont]

Notes:

• The _migration_connector() function doesn't support MongoDB currently.
• Nothing is feature gated by database connector
• If the "migrations" feature is enabled on the CLI and not runtime it will fail to compile. Hence CI issue with integration tests.

I am sure you will probs do a bunch of changes but this is just a starting place for official support for database migrations.

• Schema path should be resolved from CLI's --schema args

[oscartbeaumont]

Also, Clippy reported to change the following in Spacedrive:

• we should Box<NewClientError> cause its big
• change ConnectionInfo::from_url(&db_url) to ConnectionInfo::from_url(db_url)

[oscartbeaumont]

It's probally worth documenting or referencing to baselining in your docs about the migration feature. I ran across this with Spacedrive when jumping between branches.

[Brendonovich]

Going to merge this for now and address baselining later. May not even implement it till a future release.