[FIR] Add inline checker for bodies of inline functions

This checker doesn't support `@PublishedAPI` yet, so some BB tests for it
 were muted. #KT-46270

compiler/testData/diagnostics/tests/inline/kt4869.fir.kt

@@ -2,5 +2,5 @@ inline fun foo(f: () -> Unit) {
     val ff = { f: () -> Unit ->
         f.invoke()
     }
-    ff(f)
+    ff(<!USAGE_IS_NOT_INLINABLE!>f<!>)
 }