Cli refactor: rename wallet to cli (#6243)

* Rename Wallet structs to Cli

* Rename wallet to cli more broadly

* Update to cli/config.yml, and update docs

cli/src/lib.rs

@@ -1,6 +1,7 @@
 #[macro_use]
 extern crate lazy_static;
 
+pub mod cli;
 pub mod config;
 pub mod display;
 pub mod input_parsers;
@@ -9,4 +10,3 @@ pub mod stake;
 pub mod storage;
 pub mod validator_info;
 pub mod vote;
-pub mod wallet;