Modify the dry-run-deploys and retrieve-state tools to read the config parameters from the proper chainspec file

The tools are now using the forged config parameters, like so:
let merkle_tree_hash_activation = EraId::from(0u64);
and have some others hardcoded, like "test" for network_name.
Such change will make it easier to create storage in pub fn create_storage() function and, in turn, will allow for a more concise code in fetcher (we'll be able to pass the entire ref to chainspec to the Storage::new() instead of several separate parameters, like here).