feat: Log headers (encrypted) if large/sampled cookies appear corrupted

[timmc-edx]

Description:

Log headers (encrypted) if large/sampled cookies appear corrupted.

Enabled if encryption key is set in IDA.

JIRA:

ARCHBOM-2082

Merge checklist:

• [x] Version bumped
• [x] Changelog record added
• [x] Documentation updated (not only docstrings)
• [x] Commits are squashed

Post merge:

• [ ] Create a tag
• [ ] Check new version is pushed to PyPi after tag-triggered build is finished.
• [ ] Delete working branch (if not needed anymore)

[timmc-edx]

Drat, I could have sworn I had bumped the init version, but I hadn't. Here's a PR for that: https://github.com/openedx/edx-django-utils/pull/210