Simplify is_config() and normalize_string_keys() (#2305)
Simplify is_config() and normalize_string_keys() (#2305)

* Simplify is_config() and normalize_string_keys()

* Use __in__ to avoid the nested _ands_ and _ors_.
* Dict comprehension directly tracks with the doc string

* Keep more basic loop in normalize_string_keys

* Whitespace

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