D9 islandora

[elizoller]

Ticket: Islandora/documentation#1680
THIS PR depends on #816

What does this Pull Request do?

Updates Islandora Core for Drupal 9 support

What's new?

• remove deprecated functions
• insert new functions
• use dependency injection
• clean up for php codesniffer
• updates travis to php 7.4
• updates context, migrate_source_csv, and flysystem to versions that supports d9
• temporarily point to crayfish-commons branch that supports d9 and php 7.4
• updates migration source config (keys => ids)
• includes an update hook for updating migration config

How should this be tested?

Checkout the PR
Do a cache clear
Make sure you can do normal islandora stuff - make a node/media/file and have them all persist to fedora properly, get derivatives, etc.
Pass all the tests
Note that updatedb must be run
Due to dependency chain, I think this will only work on a d9 site

Additional Notes:

Any additional information that you think would be helpful when reviewing this PR.

Interested parties

@Islandora/8-x-committers @kayakr @jordandukart

[elizoller]

i think this is ready for a review now. let me know of anything i missed or incorrectly fixed.

[elizoller]

i think the dependencies are now failing due to :
Root composer.json requires islandora/islandora dev-travis-testing as dev-8.x-1.x -> satisfiable by islandora/islandora[dev-travis-testing]
when it would need to look at islandora/islandora:dev-d9_islandora

[manez]

This has got to be in the running for most commits on a single islandora PR 😄

Thanks so much for all of this work, @elizoller !

[dannylamb]

We are green. Let's do this!