Add Crossplane v2 support

[nateinaction]

Description of your changes

Resolves #262
More work shown in #263

This PR upgrades provider-sql to crossplane v2 with new namespaced CRs

Added:

• Namespaced MRs!
• ClusterProviderConfig for referencing cluster scoped provider configs from namespaced resources

Changed:

• apis, controllers and examples now have scoped subdirectories as cluster and namespaced
• handwritten resource resolvers have been replaced with ones generated by angryjet

⚠️ Removed:

• External Secret Store support is removed from ALL MRs (spec.publishConnectionDetailsTo is removed). This feature was alpha and it was decided to be removed from crossplane.

I have:

• Read and followed Crossplane's contribution process.
• Run make reviewable to ensure this PR is ready for review.

How has this code been tested

E2E tests pass:

make build e2e
...
>>>>>>> waiting for provider pods to be deleted
waiting another 3 seconds

 All integration tests succeeded!

>>>>>>> Cleaning up...
Deleting cluster "build-79293a62-inttests" ...
Deleted nodes: ["build-79293a62-inttests-control-plane"]
15:30:15 [ OK ] integration tests passed

Testing creating MySQL users with the various types of provider configs:

Legacy cluster provider config:

k get user.mysql.sql.crossplane.io
NAME                 READY   SYNCED   AGE
cluster-mysql-user   True    True     7s

Modern cluster and namespaced provider configs:

k get users.mysql.sql.m.crossplane.io
NAME             READY   SYNCED   AGE
cpc-mysql-user   True    True     16s
ns-user          True    True     16s

[chlunde]

Looks good! I noticed a missing resolved, could you add that and run code generation?

[chlunde]

Updates for integration tests with is in this branch: https://github.com/chlunde/provider-sql/commits/crossplane-v2/ (some more cleanup would be nice)

I'm not sure why the pg password doesn't properly reset when running two pg tests.

Feel free to take whatever you want from that branch. Maybe we should test some variants of provider configs too (at least manually).