[stdlib] Make ListLiteral subscriptable, and remove get[i, T]().

[jjvraw]

Prevent crashes similar to that seen with Tuple.get (#3935). Also addressing #319, introducing __getitem__ by forwarding Tuple.__getitem__.

[rd4com]

Hello, that one worked if need to refine this one: #3835 👍

If needed, just re-use any part of the implementation and the other PR can be closed 👍

[jjvraw]

Hi @rd4com,

Apologies for duplicating your PR! If you'd prefer, you could update python_object.mojo & object.mojo to use ListLiteral.__getitem__ directly. I could then either wait for that PR to be pulled through, or merge with yours remotely such that this PR is focused on removing get.

[rd4com]

No need to apologize this is awesome i love it 👍
just check how return type uses __type_of so that the inner tuple can do it all
The other pr i created can be closed if needed, just there for you if needed ❤️‍🔥