Docs - add usage with typescript page

[Shrugsy]

Related to #964

Adds a usage with typescript page.

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Sandbox	Source
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Vanilla Typescript	Configuration
rsk-github-issues-example	Configuration

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[Shrugsy]

RFC: Is this location in the sidebar appropriate, or would this page warrant being up one level, in line with RTK Query Overview and Comparison with Other Tools?

[Shrugsy]

RFC: Can anyone think of anything else missed that should be covered on this page?

[markerikson]

I'm actually going to say we maybe oughta move it up to the upper level.

I know that's a bit inconsistent in terms of "usage" location with our page for the RTK core (and even the Redux core), but given how many people will likely want to use RTKQ + TS together, I'd rather not have it buried in the middle of the other pages.