Add ability to use a default namespace

[liiight]

Description

My use case involved including a utility based taskfile aliased as infra. When using the taskfile, accessing the tasks under it require either adding the infra: prefix in the CLI or creating a mirroring task in the main taskfile.
I propose having the ability to set a default namespace that will allow calling tasks from included taskfile without requiring to use their name/alias.

version: '3'
includes:
  infra: ./infra
default_namespaces:
  - infra

Then when invoking task it will look for tasks in the default namespace even without using the prefix.
This will also allow overriding included tasks if the main taskfile has a task with the same name as the included taskfile.

[vmaerten]

Hello
Do you think flatten include could solve your problem? This way, you can use all of the infra’s tasks without the namespace.

[liiight]

Oh, my bad, I somehow missed this feature entirely! Yes, this will do exactly what I want it to do! Thanks a lot!