refact(crds): refactor generate cstor crds based on openAPIV3 validat…

…ion (#59)

* feat(crds): generate cstor crds based on openAPIV3 validation
- add custom columns
- add omitempty JSON tags following the APIs practices
- add nullable tags in array and time data types to accept
  them as a null value
Signed-off-by: prateekpandey14 <prateek.pandey@mayadata.io>

Makefile

@@ -30,8 +30,9 @@ generate: generate-crds
 
 generate-crds: controller-gen
 	# Generate manifests e.g. CRD, RBAC etc.
-	$(CONTROLLER_GEN) crd paths="./pkg/apis/cstor" output:crd:artifacts:config=config/crds/bases
+	$(CONTROLLER_GEN) crd:trivialVersions=true,preserveUnknownFields=false paths="./pkg/apis/cstor/..." output:crd:artifacts:config=config/crds/bases
 	# merge all crds into a single file
+	rm $(ALL_CRDS)
 	cat config/crds/bases/*.yaml >> $(ALL_CRDS)
 
 .PHONY: kubegen