Feature/add revoke logic to grant pr1

[olikyr]

Description of your changes

This is a sub PR of
#200

1. I added a field called revokePublicOnDb in grant resource; if true, it will revoke from public access to DB; This usually a DBA requirement.
2. I added a field called isPrivate revokePublicOnSchema in schema resource; if true, it will revoke from public access to a schema; This usually a DBA requirement.

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

inside the project

make clean
make build
make reviewable

[Duologic]

Why are the parameters named differently?

[olikyr]

I think you are right about this inconsistency, either they should be both isPrivate, or for schema adopt RevokePublicOnSchema.
I would go with RevokePublicOnSchema and RevokePublicOnDB as we are doing a specific command and I am afraid that private could infer a bigger context.
What do you think?

[Duologic]

yeah, that's alright