Create/find ghistory script/hook per day instead of per month.

Currently, the "cannonical" command for ghistory is:
```
ghistory.monthly
``
So
```
task ghistory
```
is interpreted as
```task ghistory.monthly
```
You can also use ```task ghistory.annual``` but ```task ghistory.daily``` does not work. Make an equivalent script and taskwarrior command that generates the intended command. e.g. ```task ghistory.daily.42``` should show the ghistory per day of the last 42 days.

Start by locating the existing ghistory.monthly and ghistory.annual scripts or hooks and the taskwarrior command mapping that interprets `task ghistory`. Add the daily equivalent so `task ghistory.daily.42` produces a per-day history for the last 42 days, then verify the command and its generated output.

Written by the indexing model from the issue text.