make adk [command]" a synonym of --help because the adk [command]'s truncated error message is redundant these days #431
Description
It's a fairly common convention to simply return the entire options of a particular CLI command if no options are given, assuming that that particular command actually requires options. It would be much more convenient, for example, if when I execute something like adk create instead of getting the heavily truncated and redundant message below, I simply am returned all the options of adk create thus sparing me of having to do the extra --help. We can keep --help naturally, but making help a synonym of the command is better imo because Try 'adk create --help' for help. is redundant at this point in time regarding CLIs.
Usage: adk create [OPTIONS] APP_NAME
Try 'adk create --help' for help.
Error: Missing argument 'APP_NAME'.
Describe the solution you'd like
Make --help a synonym of adk [command]
Describe alternatives you've considered
There are none.