Add slo support

[flenter]

This PR also includes:

• a refactor for a large portion of the code
• updates the workflow to run black & tests during ci
• changes the way exceptions are handled: the decorator will now rethrow the exception instead of just returning the error

Closes #16

[brettimus]

regarding the examples:

is there a simple way to point them to the code from the repo? (so that they run based off of what is in the repo) i wasn't totally clear on how to run them

or should we prefer that they run based off of what's the most recently published package?

[v-aparna]

regarding the examples:

is there a simple way to point them to the code from the repo? (so that they run based off of what is in the repo) i wasn't totally clear on how to run them

or should we prefer that they run based off of what's the most recently published package?

The current examples do not work with the recently published package, for them to work, a local package can be built and then used (python -m build). However, I feel examples are run better off the published package.