CASMCMS-9225: Move BOS client to new paradigm

[mharding-hpe]

CASMCMS-9225 as a whole involves changes to a number of different files in BOS. In order to aid with review, I'm breaking the overall thing up into smaller PRs. Each will be built on top of each other, and will be merging into the main PR branch. Only once each sub-PR has been approved and merged will I merge that branch into develop.
Full list of sub-PRs:

1. Added basic paging ability for GET requests to list components
2. Create generic endpoint classes
3. Create generic API client class
4. Create ApiClients class and provide it to BOS operators inside a context manager
5. Move PCS client to new paradigm
6. Move BSS client to new paradigm
7. Move CFS client to new paradigm
8. Move BOS client to new paradigm
9. Move IMS client to new paradigm
10. Move HSM client to new paradigm
11. CHANGELOG update, linting, update utils

This PR is the same as the one for PCS, but for BOS instead. The only noteworthy differences are:

1. The BOS options module was left unchanged for the time being, apart from being moved over to use a context manager, and moving to the new location inside the repo.
2. Like with CFS, one filter needed to be updated and added to the base operator, to enable it to use the built-in BOS client.

[kumarrahul04]

Reviewd, posted clarification questions.