feat: add BodyInspectionHandler

[marcinjahn]

Closes #482

Docs updates done via MicrosoftDocs/openapi-docs#140.

[andrueastman]

Thanks for the contribution here @marcinjahn

Any chance you can also run dotnet format command from the project root to resolve the linting errors?

[marcinjahn]

Thanks for the contribution here @marcinjahn

Any chance you can also run dotnet format command from the project root to resolve the linting errors?

I pushed dotnet formatted code now

[baywet]

Thank you for the contribution!

[baywet]

Thanks for the contribution!

@andrueastman for final review and merge

[marcinjahn]

@baywet @andrueastman Please have a look, I simplified it just a little bit. The RequestStream and ResponseStream are no longer nullable, they're Stream.Null by default, and this is also the value being returned anytime there is no content in request/response. Previously, I'd return null or Stream.Null and probably it doens't make sense to do that, especially since it was not documented when each one gets returned.

[andrueastman]

Thanks for the contribution @marcinjahn. Looks good from my end.

@baywet Any chance you can do a final review of the latest changes as well before merge?