Add support for tuples of layers (instead of strictly list) in LayerLRP

[Quoding]

It seems to me there is no reason why LayerLRP is restricted to lists only. It seems any ordered iterable should do the trick here.

• Add checks for tuples instead of just lists of layers in LayerLRP
• Add new type for hinting / documentation -> ModuleOrModuleListOrModuleTuple

Edit: Reference issue #1329

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