feat: Add in the beginnings of the new config builders.

config/config.ts

@@ -0,0 +1,24 @@
+import { BuilderExtract, IBuilder } from "./builder.ts";
+import { Value } from "./value.ts";
+
+export class Config<A> extends IBuilder<A> {
+  static empty() {
+    return new Config({});
+  }
+
+  static of<B extends { [key: string]: Value<unknown> }>(spec: B) {
+    // deno-lint-ignore no-explicit-any
+    const answer: { [K in keyof B]: BuilderExtract<B[K]> } = {} as any;
+    for (const key in spec) {
+      // deno-lint-ignore no-explicit-any
+      answer[key] = spec[key].build() as any;
+    }
+    return new Config(answer);
+  }
+  addValue<K extends string, B>(key: K, value: Value<B>) {
+    return new Config({
+      ...this.a,
+      [key]: value.build(),
+    } as A & { [key in K]: B });
+  }
+}