Fix GENERATED_FUNCTION array in endpoint config template

[jepenven-silabs]

Problem

Appbuilder, the predecessor of ZAP was a All in one application which could generate code for both the ZCL and the actual implementation. With ZAP the only information available is the one provided by the ZCL8 spec. Meaning that ZAP cannot produce code for things that he's not aware of. For example the fact that some cluster have an Init function and some doesn't have any. As a consequence the GENERATED_FUNCTION array is now being generated with a hardcoded preset since ZAP is unable to produce it.

Proposed Solution

Find a way to either :
Removed the GENERATED_FUNCTIONS array by changing the ZCL framework
Add back the GENERATED_FUNCTIONS array in a way that is easily scalable and not hardcoded directly in the helper.js file. Meaning that we should have an external way of signifying to zap if a cluster have an INIT_FUNCTION, MESSAGE_SENT_FUNCTION or PRE_ATTRIBUTE_CHANGED_FUNCTION

[tlykkeberg-grundfos]

What is happening with the issue? Has it been lost or what is the intention going forward?

[woody-apple]

It is not clear at this point, as everything behind it is quite out of date. @jepenven-silabs Can you please clarify what's needed now?

[bzbarsky-apple]

This is very much still an issue. We are moving the lists of things into a YAML, which may help a bit, but it's still a hardcoded list in the SDK...