get most stuff working again, by upgrading to newer esp-hal version

this involved adding a lot of code from the develop branch step by step
there are still some bugs, but at least i can get into the web interface
and configure stuff again \o/ … measuring and pumping is working as well

rust/src/webserver/backup_manager.rs

@@ -6,7 +6,7 @@ use alloc::format;
 use alloc::string::{String, ToString};
 use chrono::DateTime;
 use edge_http::io::server::Connection;
-use embedded_io_async::{Read, Write};
+use edge_nal::io::{Read, Write};
 use log::info;
 use serde::{Deserialize, Serialize};