test(tests/lean/interactive): add tests for coercion and overload info

tests/lean/interactive/overload_coercion.input

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+VISIT overload_coercions.lean
+SYNC 6
+open nat num
+variable a : nat
+variable b : num
+variable c : bool
+check a + b
+check add a c
+WAIT
+INFO 5
+INFO 6

tests/lean/interactive/overload_coercion.input.expected.out

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+-- BEGINWAIT
+-- ENDWAIT
+-- BEGININFO
+-- TYPE|5|6
+ℕ
+-- ACK
+-- IDENTIFIER|5|6
+a
+-- ACK
+-- TYPE|5|8
+ℕ → ℕ → ℕ
+-- ACK
+-- OVERLOAD|5|8
+num.add #1 #0
+--
+nat.add #1 #0
+-- ACK
+-- SYMBOL|5|8
++
+-- ACK
+-- IDENTIFIER|5|8
+nat.add
+-- ACK
+-- TYPE|5|10
+num
+-- ACK
+-- COERCION|5|10
+of_num b
+--
+ℕ
+-- ACK
+-- IDENTIFIER|5|10
+b
+-- ACK
+-- ENDINFO
+-- BEGININFO STALE
+-- TYPE|6|6
+ℕ → ℕ → ℕ
+-- ACK
+-- OVERLOAD|6|6
+num.add
+--
+nat.add
+-- ACK
+-- TYPE|6|10
+ℕ
+-- ACK
+-- IDENTIFIER|6|10
+a
+-- ACK
+-- TYPE|6|12
+bool
+-- ACK
+-- IDENTIFIER|6|12
+c
+-- ACK
+-- ENDINFO