Change order of UI extension method arguments

[Shane32]

I think the UI middleware extension methods should require the path first and then the options, rather than the other way around. I believe this just makes logical sense that you would define the endpoint address and then configure it. Plus it matches the argument ordering of the UseGraphQL method (both now and previously).

Also I generally find that it works best when optional method arguments are additive to existing/required arguments, and this change fixes that issue as well.

This will require a note in the migration doc ( #854 ) if it is merged.

Some other options:

• Leave the old methods, deprecated
• Deprecate the path-only syntax leaving only the (options, path) syntax
• Change the options argument to a builder delegate (if we do this then I would deprecate the old ones rather than removing them)

Since we have a large number of changes going into v7, perhaps now is a good time to make this change.

[sungam3r]

Yep, I was thinking about it.