Add client and server type aliases

[Alex6323]

Adds some convenience type aliases to reduce a bit of noise in inx-chronicle.

[grtlr]

My goal was to add wrapper structs around these types once the API has stabilized. These struct could then also offer the .listen_to_* and .read_* methods that map to the richer types defined under the types feature.

[Alex6323]

Yea, I figured that we eventually would wrap them, but wanted to suggest having something until that wouldn't break anything while at the same time make the code less noisy.