Add new create-composite command

[belemaire]

The current way to create a JS composite project is to use the create-container command along with the --jsOnly flag.

There is -at least- two problems with the current approach :

1. It creates confusion around platform concepts understanding, especially for new comers.
   The JS Composite is not a Container in itself, so why should one use a create-container command to create a Composite when they are not the same?

2. It makes the create-container command logic more complex to accommodate this specific option, also because of the fact that some options of the command can only be used when --jsOnly is present or the opposite (also on a most fundamental design note, the current command allows to create a Container OR create a Composite. When a single command can do two different things, that's a code smell).

For these reasons, this PR introduces a new command create-composite that can be used ... well ... to create a Composite. It removes the --jsOnly logic from the create-container command and marks this option as deprecated, informing the user to use the new create-composite command in case this option is set.

For release notes : This is a breaking change !