feat: some missing Array grind annotations (#11102)

This PR adds some annotations missing in the Array bootstrapping files.

src/Init/Data/Array/Basic.lean

@@ -226,7 +226,7 @@ def swap (xs : Array α) (i j : @& Nat) (hi : i < xs.size := by get_elem_tactic)
   let xs'  := xs.set i v₂
   xs'.set j v₁ (Nat.lt_of_lt_of_eq hj (size_set _).symm)
 
-@[simp] theorem size_swap {xs : Array α} {i j : Nat} {hi hj} : (xs.swap i j hi hj).size = xs.size := by
+@[simp, grind =] theorem size_swap {xs : Array α} {i j : Nat} {hi hj} : (xs.swap i j hi hj).size = xs.size := by
   change ((xs.set i xs[j]).set j xs[i]
     (Nat.lt_of_lt_of_eq hj (size_set _).symm)).size = xs.size
   rw [size_set, size_set]
@@ -448,7 +448,7 @@ Examples:
 -/
 abbrev take (xs : Array α) (i : Nat) : Array α := extract xs 0 i
 
-@[simp] theorem take_eq_extract {xs : Array α} {i : Nat} : xs.take i = xs.extract 0 i := rfl
+@[simp, grind =] theorem take_eq_extract {xs : Array α} {i : Nat} : xs.take i = xs.extract 0 i := rfl
 
 /--
 Removes the first `i` elements of `xs`. If `xs` has fewer than `i` elements, the new array is empty.
@@ -462,7 +462,7 @@ Examples:
 -/
 abbrev drop (xs : Array α) (i : Nat) : Array α := extract xs i xs.size
 
-@[simp] theorem drop_eq_extract {xs : Array α} {i : Nat} : xs.drop i = xs.extract i xs.size := rfl
+@[simp, grind =] theorem drop_eq_extract {xs : Array α} {i : Nat} : xs.drop i = xs.extract i xs.size := rfl
 
 @[inline]
 unsafe def modifyMUnsafe [Monad m] (xs : Array α) (i : Nat) (f : α → m α) : m (Array α) := do
@@ -1704,7 +1704,7 @@ def popWhile (p : α → Bool) (as : Array α) : Array α :=
     as
 decreasing_by simp_wf; decreasing_trivial_pre_omega
 
-@[simp] theorem popWhile_empty {p : α → Bool} :
+@[simp, grind =] theorem popWhile_empty {p : α → Bool} :
     popWhile p #[] = #[] := by
   simp [popWhile]
 
@@ -1751,7 +1751,8 @@ termination_by xs.size - i
 decreasing_by simp_wf; exact Nat.sub_succ_lt_self _ _ h
 
 -- This is required in `Lean.Data.PersistentHashMap`.
-@[simp] theorem size_eraseIdx {xs : Array α} (i : Nat) (h) : (xs.eraseIdx i h).size = xs.size - 1 := by
+@[simp, grind =]
+theorem size_eraseIdx {xs : Array α} (i : Nat) (h) : (xs.eraseIdx i h).size = xs.size - 1 := by
   induction xs, i, h using Array.eraseIdx.induct with
   | @case1 xs i h h' xs' ih =>
     unfold eraseIdx