[LL] add tests for FirDeclarationForCompiledElementSearcher

build stub if was not able to load:
expected that in IDE stubs would always be found in the index, for tests -
build from virtual file

analysis/low-level-api-fir/testdata/getOrBuildFirBinary/functionWithDefinitelyNotNullParameter.kt

@@ -0,0 +1,4 @@
+// DECLARATION_TYPE: org.jetbrains.kotlin.psi.KtNamedFunction
+class FooBar {
+    fun <T> functionWithTAndAnyValue(otherVal: T & Any) {}
+}