Optimize some imports

[iurisilvio]

Description

It fixes a few import issues, found with ruff check --select="TCH" . and with importtime-waterfall lib.

• Move some imports to if TYPE_CHECKING block
• Lazy import supervision when it is possible
• Implement own read yaml function instead of use supervision (it was triggering many extra imports)

Type of change

Please delete options that are not relevant.

• [x] Bug fix (non-breaking change which fixes an issue)

How has this change been tested, please provide a testcase or example of how you tested the change?

CI should pass.

[iurisilvio]

I think it is good to remove extra imports, it is easy to lose control of imports and it cause some overhead.

But if we don't have tooling to find errors caused by conditional imports, it is not a good thing to do. We can do that with flake8 or ruff later.