[Analysis API] Collect designations only for autonomous declarations

Parameters, type parameters, and property accessors are not
self-sufficient declarations (their resolution depends on resolution
of their parent), so a proper designation path cannot be computed
for them.

Without a designation path, 'ContextCollector' performs analysis of the
whole file, which is inefficient.

analysis/low-level-api-fir/testData/contextCollector/primaryConstructorParameter.kt

@@ -1,5 +1,5 @@
 class Foo(
-    val a: String = "foo"
-    val b: Int = <expr>a.length</expr>,
-    val c: Long = (a.length - 1).toLong()
+    a: String = "foo",
+    b: Int = <expr>a.length</expr>,
+    c: Long = (a.length - 1).toLong()
 )