Fix: Handle numeric enum from OpenAPI spec

[ashnewport]

Fixes #45

Actual code change is on lines 404-405.

Open API spec with:

...
    "ExStatus": {
        "enum": [
          0,
          1,
          2
        ],
        "type": "integer",
        "format": "int32"
      },
...

should now output as:

export type ExStatus = 0 | 1 | 2;

Additional changes are from Husky hooks to format code.

[jonkoops]

Thanks @ashnewport!

[ecrofeg]

Hi there! Guys, what about the release of this fix? RTKQ is suffering from this so much :(

reduxjs/redux-toolkit#1788

[nickwang0808]

Hi guys, are we releasing this soon? Really need this for RTKQ as well.