refactor Timeline class to pydantic model (Sourcery refactored)

[sourcery-ai]

Pull Request #30 refactored by Sourcery.

If you're happy with these changes, merge this Pull Request using the Squash and merge strategy.

NOTE: As code is pushed to the original Pull Request, Sourcery will
re-run and update (force-push) this Pull Request with new refactorings as
necessary. If Sourcery finds no refactorings at any point, this Pull Request
will be closed automatically.

See our documentation here.

Run Sourcery locally

Reduce the feedback loop during development by using the Sourcery editor plugin:

• VS Code
• PyCharm

Review changes via command line

To manually merge these changes, make sure you're on the refactor#28 branch, then run:

git fetch origin sourcery/refactor#28
git merge --ff-only FETCH_HEAD
git reset HEAD^

[sourcery-ai]

Sourcery Code Quality Report (beta)

Merging this PR leaves code quality unchanged.

Quality metrics	Before	After	Change
Complexity	0.00	0.00	0.00
Method Length	40.66	40.41	-0.25 🔵
Quality	9.07	9.07	0.00

Other metrics	Before	After	Change
Lines	58	58	0

Changed files	Quality Before	Quality After	Quality Change
tests/test_location.py	9.07	9.07	0.00

Please see our documentation here for details on how these metrics are calculated.

We are actively working on this report - lots more documentation and extra metrics to come!

Let us know what you think of it by mentioning @sourcery-ai in a comment.