1/2 analysis-api: Initial implementation for contracts

Review: https://jetbrains.team/p/kt/reviews/7652

I need this API for KTIJ-22692

analysis/analysis-api/testData/symbols/singleSymbolByPsi/contracts/isInstancePredicateContract.kt

@@ -0,0 +1,17 @@
+// WITH_STDLIB
+// DO_NOT_CHECK_NON_PSI_SYMBOL_RESTORE_K1
+import kotlin.contracts.ExperimentalContracts
+import kotlin.contracts.InvocationKind
+import kotlin.contracts.contract
+
+class Foo
+
+@OptIn(ExperimentalContracts::class)
+fun isInstancePredicateContract(value: Any) {
+    contr<caret>act {
+        returns() implies (value is Foo)
+    }
+    if (value !is Foo) {
+        throw IllegalStateException()
+    }
+}