Track component initialisations for error messages

[elikoga]

closes #278

provides a warning if a component is initialized, but not prepared:

Say we have the tutorial-helloworld:
component.py:

class Hello(Component):
    def configure(self):
        self += File("hello", content="Hello world")
        File("")

This gives us an error message like this:

batou/2.5.dev0 (cpython 3.7.16-final0, Darwin 23.1.0 arm64)
================================== Preparing ===================================
main: Loading environment `tutorial`...
main: Verifying repository ...
main: Loading secrets ...
================== Connecting hosts and configuring model ... ==================
localhost: Connecting via local (1/1)
WARN: A Component 'File' was initialized but was not prepared (configured).
This may not be what you want
================================== Deploying ===================================
localhost: Scheduling component hello ...
=================================== Summary ====================================
Deployment took total=0.23s, connect=0.23s, deploy=0.00s
============================= DEPLOYMENT FINISHED ==============================

Of course the warning is yellow too:

incorrectly approved

[ctheune]

See the note about that this should be erroring out instead of just warning.

[ctheune]

What does the output look like now? Does the user have a chance to figure out where this happened? (We can keep track of the call stack during init and then use that to indicate the problem later.)

[zagy]

The changelog is missing.

[elikoga]

We can keep track of the call stack during init and then use that to indicate the problem later.)

PR doesn't included that yet so I'll draft this one