ruby/ruby@989e07c features switching `Range#===` to use internal `r_cover_p`
instead of rubyland `include?`. This breaks expected behavior of
`ActiveSupport::CoreExt::Range` documented since at least 8b67a022.

This patch adds overrides on `Range#cover?` and `Range#===` and places all
three in a single module, `CompareWithRange`.

*Requiring core_ext/range/include_range now causes a deprecation warnning*