deps(rustls+openssl): re-export rustls and openssl dependencies ?

[oleonardolima]

As mentioned in a discord discussion, a user relying on the use-rustls feature needs to also depend on rustls dependency making sure to match the dependency version, to properly use rust-electrum-client with rustls, as it relies on a CryptoProvider implementation.

Alongside that there's a lack of documentation regarding the proper usage of this project with use-rustls and CryptoProvider inner workings.

It can be solved by using the use-rustls-ring feature, however, it'd be easier if the users had access to a re-exported version of the rustls.

Also, does that also applies for openssl one ?