Rename/alias either provider or providers and add a deprecation warning.

[rshade]

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Issue details

In troubleshooting #11316, it was discovered that the usecase for provider and providers is very confusing. A new user would easily stumble on this. I suggest we pick a more descriptive set of names, and go ahead and alias them now for future deprecation.

Affected area/feature

Pulumi SDK

[Frassle]

I think these options need an overhaul in general but I suspect it will all have to wait for 4.0, there's too many uses of these options already that making changes here will break a lot of current users.

[rshade]

My overarching reason to start brainstorming and planning those changes now is because we have so many users using it already we need them to start thinking about the change and not introduce it shockingly in 4.0. If we create the alias now or shortly in future release we can give them plenty of time to upgrade or comment on the change.

[Frassle]

I don't think it's just the name that's the issue here. I don't think the semantics of these are consistent across languages either, or across MLCs vs in program components. It's all a bit of a mess.