RSpec/SharedContext: needs CustomIncludeMethods setting

[zverok]

This setting exists for RSpec/EmptyExampleGroup, and is needed for SharedContext too: otherwise, the cop creates false positives with custom methods akin to its(:foo) { ... }.
We use those, but I believe there are several gems providing additional methods.

[pirj]

Agree, the detection of its etc needs to be supported, probably not limited to EmptyExampleGroup and SharedContext, but some existing, future and custom cops.

Adding aliases and configuring acceptable DSL is currently in the works in #956, it should pretty much cover this case.

Keeping this ticket open to remember about this case (we have quite a number of tickets that this DSL configuration will resolve).

Related: #333

[pirj]

PS we plan to drop CustomIncludeMethods in #969, and release it with 2.0 when the DSL configuration from #956 will be able to substitute what CustomIncludeMethods does now.

[pirj]

#956 has been released as part 2.0.

A reference implementation on how to allow third-party gems to configure their RSpec DSL configuration for RuboCop RSpec is tracked in #1077

Appreciate if you could handle it in saharspec provided the preliminary plan, @zverok.

[pirj]

@zverok Example PRs palkan/action_policy#138, test-prof/test-prof#199