allow entering duration in Months

[VladimirAlexiev]

Is your feature request related to a problem? Please describe.
#2850 shows an example of scheduling in Months (often used in Horizon Europe research proposals).
Task duration can be specified in hours (eg 720h), days (eg 30d), weeks (eg 4w) but not months

Describe the solution you'd like
Allow specifying duration in months (eg 1m) and maybe even quarters

Describe alternatives you've considered
MS Project allows this

[carbeer]

Would love to see this as well. Just wanted to mention that m is used to indicate time in minutes as of now.

Edit: I checked the code and it seems like this is supported since a recent commit: M is parsed as month, Y as year. Here's an example.