Add stats summary about atuin HOT 3 CLOSED

Hi there 👋🏽 ,

I was playing around with atuin (and rust) and was looking into something that I could pick up. Wanted to check in if thsi issue is still valid. And if so can you help in fleshing this out a bit more?

From what I understand;

The atuin stats could be:

> atuin stats last friday 
# displays  statistics for last friday

> atuin stats 01/01/2022
# displays  statistics for 1st Jan '22

> atuin stats monday
# displays  statistics for last monday

> atuin stats march
# displays stats for last march (2022-03-01 to 2022-03-31) , this currently displays for 1st March '22 only.

from atuin.

Yeah that looks correct. The stats logic is already present in the Day subcommand, it just needs to be reshuffled a bit

from atuin.

In order to consider reducing parsing complexity , I would also propose simplying how it is currently parsed.
i.e. atuin stats friday can be considered equivalent to atuin stats last friday. Any day of the week would correspond to the the nearest past date and if it needs to be more specific , the user could specify an explicity date.
wdyt about this?

from atuin.