Add tutorial and API docs for HTTP crawler log submission

[iliakur]

What does this PR do?

Adds overview, API and tutorial docs for the "logs from http crawlers" feature.

Some notes:

• This is quite a bit of text. It's best to view it with ddev docs serve in your browser.
• I'd like to flesh out the API docs some more, I'll do that later in a follow-up.

Motivation

Additional Notes

Review checklist (to be filled by reviewers)

• [ ] Feature or bugfix MUST have appropriate tests (unit, integration, e2e)
• [ ] Changelog entries must be created for modifications to shipped code
• [ ] Add the qa/skip-qa label if the PR doesn't need to be tested during QA.
• [ ] If you need to backport this PR to another branch, you can add the backport/<branch-name> label to the PR and it will automatically open a backport PR once this one is merged

[rtrieu]

Created DOCS-8751 for docs review.