feat: base patch resource support

[discount-elf]

This is draft of what a patch with only provided fields could look like. Unsure if we will carry this forward or not.

new bucket.BucketPatch {
  modify { // name of this node could be better, only needed due to type system limitations
    // must provide the label of the resource to patch
    label = "bucket-to-patch"
    // any properties that are to change validated against the schema inline as expected
    versioningConfiguration = new bucket.VersioningConfiguration {
      status = "Enabled"
    }
  }
}

Sadly if Pkl supported extending Mixin or annotating functions the result could have been:

new Patch<bucket.Bucket> {
  label = "bucket-to-patch"
  versioningConfiguration = new bucket.VersioningConfiguration {
    status = "Enabled"
  }
}