Extract checks on equality expressions into a separate checker

^KT-43493 Fixed

compiler/testData/diagnostics/tests/inference/builderInference/equalityChecksWithIlt.fir.kt

@@ -0,0 +1,19 @@
+// WITH_RUNTIME
+
+fun main(x: Long, y: Int) {
+    sequence {
+        1L == 3
+        x == 3
+        3 == 1L
+        3 == x
+        y == x
+
+        1L === 3
+        x === 3
+        3 === 1L
+        3 === x
+        y === x
+
+        yield("")
+    }
+}

compiler/testData/diagnostics/tests/inference/builderInference/equalityChecksWithIlt.kt

@@ -0,0 +1,19 @@
+// WITH_RUNTIME
+
+fun main(x: Long, y: Int) {
+    sequence {
+        <!EQUALITY_NOT_APPLICABLE("==; Long; Int")!>1L == 3<!>
+        <!EQUALITY_NOT_APPLICABLE("==; Long; Int")!>x == 3<!>
+        <!EQUALITY_NOT_APPLICABLE("==; Int; Long")!>3 == 1L<!>
+        <!EQUALITY_NOT_APPLICABLE("==; Int; Long")!>3 == x<!>
+        <!EQUALITY_NOT_APPLICABLE("==; Int; Long")!>y == x<!>
+
+        <!EQUALITY_NOT_APPLICABLE("===; Long; Int")!>1L === 3<!>
+        <!EQUALITY_NOT_APPLICABLE("===; Long; Int")!>x === 3<!>
+        <!EQUALITY_NOT_APPLICABLE("===; Int; Long")!>3 === 1L<!>
+        <!EQUALITY_NOT_APPLICABLE("===; Int; Long")!>3 === x<!>
+        <!EQUALITY_NOT_APPLICABLE("===; Int; Long")!>y === x<!>
+
+        yield("")
+    }
+}

compiler/testData/diagnostics/tests/inference/builderInference/equalityChecksWithIlt.txt

@@ -0,0 +1,4 @@
+package
+
+public fun main(/*0*/ x: kotlin.Long, /*1*/ y: kotlin.Int): kotlin.Unit
+