places and places nearby need an optional fields parameter like places

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**Is your feature request related to a problem? Please describe.**
I am frustrated the places and places_nearby function calls do not allow me to specify the fields I want returned like in the place function call.

**Describe the solution you'd like**
A clear and concise description of what you want to happen.
I would love an optional fields parameter to help me shorten the length of responses.

**Describe alternatives you've considered**
A clear and concise description of any alternative solutions or features you've considered.

**Additional context**
Add any other context or screenshots about the feature request here.

https://github.com/googlemaps/google-maps-services-python/blob/master/googlemaps/places.py

Open googlemaps/places.py and inspect the places and places_nearby entry points alongside the existing place call's fields handling. Done means both calls accept an optional fields parameter and use it to shorten responses as requested; verify the behavior against the linked implementation context.

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