Add AsyncWebsocketClient

[LimpidCrypto]

High Level Overview of Change

This PR is a replacement of #67 to fix the incorrect base branch of #67 . The changes are basically the same.

Adds an AsyncWebsocketClient to establish a websocket connection to a XRPL node.
Features:
"net" and "embedded-websocket": To establish a websocket connection the crate embedded-websocket is used.
"net" and "tungstenite": To establish a websocket connection the crate tokio-tungstenite is used.

The PR also updates some dependencies.

Type of Change

• New feature (non-breaking change which adds functionality)

TODO:

• Handle unwraps

[sephynox]

We should probably do package updates in a separate PR of their own in the future.

[sephynox]

We should fix the deprecation warnings such as use of deprecated method chrono::TimeZone::timestamp: use timestamp_opt() instead.