Move to CLI schema

[ezgidemirel]

Description of your changes

This change updates the provider to use CLI schema.

Fixes #42

I have:

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

How has this code been tested

I created/deleted SQL DB instance, SQL DB, GKE cluster resources.

NAME                                                       READY   SYNCED   EXTERNAL-NAME      AGE
cluster.container.gcp.jet.crossplane.io/ezgi-gke-cluster   True    True    ezgi-gke-cluster   24m

NAME                                                       READY   SYNCED   EXTERNAL-NAME   AGE
databaseinstance.sql.gcp.jet.crossplane.io/ezgi-instance   True    True     ezgi-instance   61m

NAME                                               READY   SYNCED   EXTERNAL-NAME   AGE
database.sql.gcp.jet.crossplane.io/ezgi-database   True    True     ezgi-database   26m

[ezgidemirel]

@turkenh PR is ready for review :)

[turkenh]

Looking great except for one typo!
Feel free to merge it once you fixed it.