Move orioledb to extensions schema by default

[olirice]

Moves the orioledb extension to the extensions schema if:

• orioledb is enabled in the public schema
• the extensions schema exists

This is important because orioledb exposes some entities that we don't necessarily want exposed over APIs by default

[samrose]

@olirice anything I can do to help move this one forward?

[olirice]

to the best of my knowledge this is ready to merge. but pending review from backend
i haven't added many migrations so would be good to get a real review in case there are any flows im not aware of

[samrose]

@olirice I am going to try to and test this out later today based on your branch.

If you have specific scenarios beyond the success of migration, pause/restore, extension compat that would be important to test please let me know

[samrose]

@olirice recommending that we use this, which mirrors your changes but based off of the latest develop branch

#1448

Just need to sort out the testinfra issue on that, and should be good to go