.Net: Simplify how additional text search filter parameters are specified

[markwallace-microsoft]

See: #8307 (comment)

Once we get to implementation, it'll be nice to have a built in variation of this whole method, that just takes a function name, description and kernel parameter metadata in addition to query count and skip.
That way, someone can just pass in the function name, description and a parameter for site, and here in the highlighted section, we can loop over the passed in parameters, and just get them one by one from arguments, and add them to the basic filter automatically.

That way, someone doesn't have to write any of this for the simple case where they just want another parameter that should be passed along as a filter option.