Add `pop` method to dict built-in type

[chrisnovakovic]

dict.pop(key[, default])

This method removes the given key from the dictionary and returns its value if it existed, or the given default if it didn't. The semantics are similar to Python's and Starlark's in that dict.pop(key) causes an error to be raised when key does not exist, similarly to dict[key].

[stale[bot]]

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