"Top 3 months" & "top 6 months" & "top 9 months" sorting options

[M4rtineski]

Requirements

• [X] Is this a feature request? For questions or discussions use https://lemmy.ml/c/lemmy_support
• [X] Did you check to see if this issue already exists?
• [X] Is this only a feature request? Do not put multiple feature requests in one issue.
• [ ] Is this a UI / front end issue? Use the lemmy-ui repo.

Is your proposal related to a problem?

I saw that someone made a pull request for sorting things by hours and it came to my mind that we should have something for months too because jump from "top month" to "top year" has a huge gap.

Describe the solution you'd like.

Add a sorting option by "top 3 months", by "top 6 months" and "top 9 months"

Describe alternatives you've considered.

no alternatives come to my mind

Additional context

No response