[LL FIR] rewrote in-block modifications logic

Now we will invalidate bodies for FIR declarations
immediately after in-block modifications in these declarations
We assume that such in-block modifications can happen
only under write action,
so it should be safe to make changes for FirFile

^KT-59687 Fixed
^KT-59199 Fixed
^KTIJ-26066 Fixed

analysis/low-level-api-fir/testdata/inBlockModification/memberFunWithBodyWithErrorContract.kt

@@ -0,0 +1,9 @@
+import kotlin.contracts.*
+
+class A {
+    fun passLa<caret>mbdaValue(l: ContractBuilder.() -> Unit) {
+        contract(l)
+    }
+}
+
+fun doSmth(i: String) = 4