Multi-index support (with datetimes)

[naterush]

Describe the bug A clear and concise description of what the bug is.

To Reproduce Steps to reproduce the behavior:

1. Go to '...'
2. Click on '....'
3. Scroll down to '....'
4. See error

Please include the relevant dataset if the bug you encountered is dataset specific. Make sure to anonymize the data properly.

Expected behavior A clear and concise description of what you expected to happen.

Screenshots If applicable, add screenshots to help explain your problem.

Desktop (please complete the following information):

• OS: [e.g. Windows 11]
• Browser [e.g. Chrome, Firefox]
• Mito Version [e.g. 0.3.331] (you can find this with pip list)

Additional context Add any other context about the problem here.