feat(topology/bases): add interior_pi #8642
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Similar to https://leanprover-community.github.io/mathlib_docs/topology/continuous_on.html#closure_pi_set
@PatrickMassot has a better version at https://leanprover.zulipchat.com/#narrow/stream/113488-general/topic/interior.20of.20set.20pi/near/249219987, so this PR will be closed when that lands.