Object inspection creators

[Voltra]

Add two functions asKeysSequence and asValuesSequence that act similarly to asSequence but for objects.

• asKeysSequence helps with easily creating a Sequence for an object's keys, a Map's keys or anything that exposes a keys method that returns an Iterable of keys
• asValuesSequence helps with easily creating a Sequence for an object's values, a Map's keys or anything that exposes a values method that returns an Iterable of values