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

[alexandrelarouche]

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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[craymichael]

Hi, thanks for the contribution! Can you please make the following changes:

• Replace utilization and import of ModuleOrModuleList with ModuleOrModuleListOrModuleTuple
• Simplify type checks as isinstance(self.layer, (list, tuple))
• Rebase onto captum's master