Add two new diagnostics: one for mismatch in generic arguments count, and another for mismatch in their kind

Also known as E0747 and E0107.

And by the way, rewrite how we lower generic arguments and deduplicate it between paths and method calls. The new version is taken almost straight from rustc.

This commit also changes the binders of `generic_defaults()`, to only include the binders of the arguments up to (and not including) the current argument. This make it easier to handle it in the rewritten lowering of generic args. It's also how rustc does it.

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