Add ConstructorId to results data, and new load_constructors() function

[pbulsink]

Partial resolution of #37.

[pbulsink]

Note likely some test failures if fastf1 isn't available to the test suite - I have another PR ready to come with that resolved.

[pbulsink]

My unfamiliarity with Github (and forgetting to wait between PR & more work in a branch) caused this commit & revert, sorry.

[SCasanova]

Hmm it seems checks have failed for some reason

[pbulsink]

Ya there were some changes to fastf1 in their new version 3.0.0 (see https://github.com/theOehrly/Fast-F1/releases/tag/v3.0.0). I have changes ready to come that fix it but they currently require fastf1 >= 3.3.0. I might try make it more flexible to work differently depending on which version is installed, else it's a breaking change to the package for everyone who's on older fastf1 versions. I think I'll close this, bring in those changes, then reopen this PR.