Add 'cache-and-network' definition to FetchPolicy

[Fonger]

re: trojanowski/react-apollo-hooks#163

Checklist:

• If this PR is a new feature, please reference an issue where a consensus about the design was reached (not necessary for small changes)
• Make sure all of the significant new logic is covered by tests

[apollo-cla]

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[sgoll]

I think a better way to solve the issue at hand (trojanowski/react-apollo-hooks#163) would be to use the new type WatchQueryFetchPolicy as useQuery uses watchQuery under the hoods (instead of query where cache-and-network cannot be implemented).

Cf. #3130 (comment) for details.

PS: I now see this approach has already been taken in PR trojanowski/react-apollo-hooks#165.

[hwillson]

Thanks for this PR @Fonger. We prefer the approach outlined in #4878 (comment) to work around this issue. Thanks again!