types: enum pointer values

[chris-ramon]

Overview

• Built on top of: Support use of pointers with Enum types #206 — thanks a lot @threadwaste
• types: adds support for using pointers values on enum type.
• types/test: adds test for enum types pointer values.

Test plan

• go test ./...

[coveralls]

Coverage increased (+0.04%) to 82.132% when pulling 5727b3a on enum-type-pointers into 9b68c99 on master.

[coveralls]

Coverage increased (+0.04%) to 82.132% when pulling 5727b3a on enum-type-pointers into 9b68c99 on master.