orm: struct field support (#8517)

examples/database/orm.v

@@ -0,0 +1,44 @@
+import sqlite
+
+struct Module {
+	id           int
+	name         string
+	nr_downloads int
+	creator      User
+}
+
+struct User {
+	id             int
+	age            int
+	name           string
+	is_customer    bool
+	skipped_string string [skip]
+}
+
+fn main() {
+	db := sqlite.connect(':memory:') or { panic(err) }
+	db.exec('drop table if exists User')
+	db.exec("create table Module (id integer primary key, name text default '', nr_downloads int default 0, creator int default 0);")
+	db.exec("create table User (id integer primary key, age int default 0, name text default '', is_customer int default 0);")
+
+	mod := Module{
+		name: 'test'
+		nr_downloads: 10
+		creator: User{
+			age: 21
+			name: 'VUser'
+			is_customer: true
+		}
+	}
+	sql db {
+		insert mod into Module
+	}
+	
+	modul := sql db {
+		select from Module where id == 1
+	}
+
+	println(modul.name)
+	println(modul.creator.name)
+	
+}