squash! Add riot-rs-random crate and corresponding initialization

Co-authored-by: ROMemories <[email protected]>

src/riot-rs-random/src/lib.rs

@@ -1,4 +1,4 @@
-//! Crate that provides a seeded random number generator depending on RIOT-rs's configuration
+//! Provides a seeded random number generator depending on RIOT-rs's configuration.
 //!
 //! The module provides a single function for use by applications, [`get_rng()`], produces an owned
 //! RNG of type [`Rng`] to the application.