feat(query-client): support for passing custom QueryClient instance …

[radekdob]

…via function

PR Checklist

Please check if your PR fulfills the following requirements:

• The commit message follows our guidelines: https://github.com/ngneat/query/blob/master/CONTRIBUTING.md#commit
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

• Bugfix
• Feature
• Code style update (formatting, local variables)
• Refactoring (no functional changes, no api changes)
• Build related changes
• CI related changes
• Documentation content changes
• Other... Please describe:

What is the current behavior?

provideQueryClient() function accepts only QueryClient instance, so it is not possible to pass a custom instance being in injection context.
Accepting a function as argument allows to be in injection context and pass object which was e.g. provided via DI in different place.

Issue Number: 204

What is the new behavior?

provideQueryClient() function accepts also a function as argument

Does this PR introduce a breaking change?

[ ] Yes
[x] No

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[luii]

@NetanelBasal LGTM