Add support for initializing Connections from Settings instances

[Mandrenkov]

Context:
One of the most common operations performed by XCC users after configuring their Xanadu Cloud API key is creating a new Connection instance. The easiest way to do this without invoking the (private) xcc.commands.load_connection() function is to initialize a Settings instance and manually specify each keyword argument to Connection.__init__(); however, this is quite tedious and leads to a suboptimal user experience.

Description of the Change:

• Added the Connection.load() function which creates a Connection object from an implicit or explicit Settings instance.

import xcc

# Initialize a Connection using an implicit Settings instance.
connection = xcc.Connection.load()

# Initialize a Connection using an explicit Settings instance.
connection = xcc.Connection.load(settings=xcc.Settings())

Benefits:

• It is easier to instantiate a Connection instance using environment variables or the Xanadu Cloud .env file.

Possible Drawbacks:
None.

Related GitHub Issues:
None.

[doctorperceptron]

Great feature!