refactor(policy): change proto files names

proto/policy.proto

proto/policy_action.proto

proto/policy_condition.proto

src/policy/src/main/proto/policy-action.proto

src/policy/src/main/proto/policy-condition.proto

src/policy/src/main/proto/policy_action.proto

src/policy/src/main/proto/policy_condition.proto

src/policy/target/generated-sources/grpc/policy/Policy.java

...cy/target/generated-sources/grpc/policy/PolicyAction.java

...target/generated-sources/grpc/policy/PolicyCondition.java

src/policy/target/kubernetes/kubernetes.yml