fix: move client setup code into init method

[joconnor-ecaa]

Description

Non-urgent

Resolves #18

Client setup code (including auth) now only runs at init time, not import time.

Checklist

• [x] Dependencies install correctly in a clean environment and code executes;
• [x] Test coverage extended; created tests fail without the change (if possible);
• [x] All tests passing;
• [x] Commits follow a type convention (e.g. https://gist.github.com/brianclements/841ea7bffdb01346392c#type);
• [x] Extended the README, documentation and/or docstrings, if necessary;

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Name	Status	Preview	Updated (UTC)
feo-client	✅ Ready (Inspect)	Visit Preview	Dec 1, 2023 5:29pm

[joconnor-ecaa]

This does not fix the bug