FIR IDE: move analysis api fir testdata to the analysis directory

analysis/analysis-api/testData/components/declarationRenderer/simpleClass.kt

@@ -0,0 +1,15 @@
+interface SomeInterface {
+    fun foo(x: Int, y: String): String
+    val bar: Boolean
+}
+class SomeClass : SomeInterface {
+    private val baz = 42
+    override fun foo(x: Int, y: String): String {
+        return y + x + baz
+    }
+    override var bar: Boolean
+        get() = true
+        set(value) {}
+    lateinit var fau: Double
+}
+inline class InlineClass