fix(types): add bootstrap sizes for Form.Label as column

[dalevfenton]

I'm not sure if just extending FormLabelProps with ColProps is the preferred way to solve this issue or if you would want something that actually enforces that the column size props are only valid when column is true.

I can make the typing stricter if that's preferred. It also seems like generally types aren't imported around and reused so if that's a problem I can copy them over completely from Col.d.ts

[jquense]

I wonder if the right way to do this is via a type Union, e.g. FormLabel | FormLabelWithColProps there column is true or false specifically (instead of boolean) to allow TS to differentiate

[dalevfenton]

I started to do that, but didn't see that throughout the other typings so I wasn't sure if there was a preferred style. Let me write it up with the type Union.

[jquense]

can you also add a few tests in simple-test.tsx for this

[dalevfenton]

one thing to note is that since FormLabelProps is now a type instead of an interface if anyone is currently using that to extend their own interface it will break their interface declaration

[dalevfenton]

@jquense I think this should be good to go now.

[jquense]

thanks!