[Scenes] Fix SceneTableSize

[lpbeliveau-silabs]

Currently, the attribute SceneTableSize is dictated by CHIP_CONFIG_MAX_SCENES_PER_ENDPOINT from CHIPConfig.h and doesn't get modified from the Zap configuration.

We need to allow users to defined the size of the scene table by zap from the scenes-server.cpp

[bzbarsky-apple]

If we want this defined via ZAP, why are we doing it via AttributeAccessInterface at all?

[lpbeliveau-silabs]

Currently we are only getting the SceneCount and RemainingCapacity through the AttributeAccessInterface, SceneTableSize should not rely on it. Unless I am mistaken.

[bzbarsky-apple]

Then I am confused. We're not using CHIP_CONFIG_MAX_SCENES_PER_ENDPOINT for the attribute value... Is this issue then about setting CHIP_CONFIG_MAX_SCENES_PER_ENDPOINT or some equivalent automatically to the largest SceneTableSize set in ZAP across all endpoints?

[lpbeliveau-silabs]

Yes, that is the actual problem. CHIP_CONFIG_MAX_SCENES_PER_ENDPOINT should be equivalent to the zap parameter, otherwise someone trying to configure a device with a SceneTableSize > CHIP_CONFIG_MAX_SCENES_PER_ENDPOINT would face unexpected Resource exhausted errors.