feat: custom index route

[aliemir]

Added indexRoute property to options of <Refine/> component to manage initial route of the app if users wants to change that from first resource's route to something else.

Test plan (required)

Passing other than a react-query issue in the next.

Closing issues

Resolves #1285 #2544 #2545 #2546

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[omeraplak]

🎖️

[salihozdemir]

How is it if we rename "openingRoute", "landingPage" or "startupPage" instead of "indexRoute". "indexRoute" name doesn't explain itself well enough.

[aliemir]

We'll move the option to routerProvider functions and rename it to defaultRoute if everyone agrees.