[libTooling] Rename overloaded `range` range selector.

Renames the overloaded `RangeSelector` combinator `range` to the more
descriptive `enclose` and `encloseNodes`. The old overloads are left in place
and marked deprected and will be deleted at a future time.

Reviewed By: tdl-g

Differential Revision: https://reviews.llvm.org/D82592