Offer a way to group by Day-Month of Year

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**Is your feature request related to a problem? Please describe.**

Currently there is no straight forward way to plot Year comparisons like 2024 vs 2025 via the Query Builder

**Describe the solution you'd like**
I would like a group by option as "Day-Month of Year"

**Describe alternatives you've considered**
You can still achieve this using Custom Columns:

For example lets say I have a date, you can extract the month, then day and concat each:

Month - monthName(month([Created At]))
Day - day([Created At])
Month-Day - concat([Month], "-", [Day])

Then use that new column as your group by:

The only tricky part is that since this is now a text the order will be of course based on text. So you should still keep the date as a column in the group by and use it only for ordering purposes. Then only visualize the Month-Day

**How important is this feature to you?**
Would be a nice to have

Start from the Query Builder's existing group-by date options and the custom-column workaround described in the issue. Determine how a Day-Month of Year grouping should be represented and ordered, then verify that it supports year-over-year plots without requiring concatenated custom columns.

Written by the indexing model from the issue text.