Move LSP semantics into typed analysis

examples/generics.gt

@@ -0,0 +1,15 @@
+package main
+
+data class Box<T>(var value: T) {
+    fun get(): T { return value }
+}
+
+fun identity<T>(value: T): T { return value }
+
+fun main() {
+    val number = identity(42)
+    val text = identity<String>("value")
+    val box = Box(text)
+    println(number)
+    println(box.get())
+}

examples/http_server.gt

@@ -30,7 +30,7 @@ class EpicControllerImpl(val db: *bun.DB) {
         db.NewCreateTable().Model(model).IfNotExists().Exec(ctx)
         val user = BunUser("user-from-gotlin")
         db.NewInsert().Model(user).Exec(ctx)
-        val total = db.NewSelect().Model(model).Count(ctx)
+        val total = db.NewSelect().Model(model).Count(ctx).unwrap()
 
         fmt.Fprintln(w, "bun users total:", total)
     }