* don't require default features for an API crate
Let the consumer define by overriding the features for the inner deps as needed.
Cargo feature resolution allows this.
Ref https://github.com/paritytech/polkadot/pull/5792
* Update client/relay-chain-inprocess-interface/Cargo.toml
Co-authored-by: Bastian Köcher <bkchr@users.noreply.github.com>