Adds the ability to select a template which will create a new file
in the CWD with the template name. Templates present in the
"cmd/dagger/project/templates" directory are automatically embedded in the dagger
binary when building and then listed in the `dagger project init` help output.
Usage:
dagger project init -t <template_name>
One idea that we had while pairing on this is to eventually try
improving this UX by extending the `dagger project` command by adding
sub-commands like `dagger project templates [list, new, output, ...]`.
Pair: gerhard
Signed-off-by: Marcos Lilljedahl <marcosnils@gmail.com>