Feature Requests: Improved Menu support in block coding and improved menu in python

[bcfletcher]

the hub_menu() is one of the coolest features of pybricks but to use it effectively is not clear. i have posted an example on how we used it with our FLL robots

some suggestions:

1. add menu support to block coding
2. add menu template to the default pybricks new project
3. provide a way to make the menu.py the master file for a project which can consist of multiple other .py files - this is related to issue Feature Request: Consolidated Code Push #2173

for example in the list of files have a structure like this

my_project_menu.py
- task1.py
- task2.py
- task3.py
- robot_library.py
- robot_config.py

so when my_project_menu.py is pushed (or any children) to the robot all the other .py will as well. you can do that today but the relationship between the files is not visually clear

4. provide a clearer way in python and define a new way for block to associate multiple .py files with a single menu.py file.

since python doesn't really support easily loading programs into slots on the hub like in spike prime app. the menu.py has to do it.

personally, i like the menu.py approach since this provide a simple, reliable, and powerful way to know which programs are on the hub. spike prime is a mess to figure that out.

but the mechanism for doing it currently in pybricks isn't very intuitive especially for kids.

thank you for your consideration!

[bcfletcher]

this is similar to #1903