gcongr attributes for lemmas up in the import chain

In this file we add gcongr attribute to lemmas in Lean.Init. We may add lemmas from other files imported by Mathlib/Tactic/GCongr/Core later.

theorem Mathlib.Tactic.GCongr.imp_trans {a b c : Prop} (h : a → b) : (b → c) → a → c

theorem Mathlib.Tactic.GCongr.imp_right_mono {a b c : Prop} (h : a → b → c) : (a → b) → a → c

theorem Mathlib.Tactic.GCongr.and_right_mono {a b c : Prop} (h : a → b → c) : a ∧ b → a ∧ c