feat(bootstrapping): add bootstrap load balancer and DHCP configurations

- Introduce `bootstrap_load_balancer` module for handling initial load balancing configuration.
- Add `bootstrap_dhcp` module for bootstrapping DHCP settings.
- Create `harmony_types` crate to house shared types, including `MacAddress`.
- Update `harmony_macros` to use `harmony_types` instead of directly referencing `harmony`.

harmony-rs/harmony_macros/src/lib.rs

@@ -1,6 +1,5 @@
 extern crate proc_macro;
 
-use harmony::topology::MacAddress;
 use proc_macro::TokenStream;
 use quote::quote;
 use syn::{LitStr, parse_macro_input};