Refactor Postgrest syntax and implementation

[jan-tennert]

What kind of change does this PR introduce?

Feature (closes #352 and #342)

What is the old behavior?

The old syntax looks something like this:

val city = City(name = "The Shire", countryId = 554)
supabase.postgrest["cities"].insert(city, returning = Returning.MINIMAL)

supabase.postgrest["countries"].update(newCity, returning = Returning.REPRESENTATION, count = Count.EXACT) {
   eq("id", 1)
}

What is the new behavior?

This PR refactors the Postgrest syntax. All parameters in the query methods (insert, update, delete etc.) have been moved to the new request builder. Here is an example (this is just to show all methods, you'll most likely not use all of them together):

val result = supabase.postgrest["message"].update(newMessage) { //you can also use supabase.from("message")
    select()
    count(Count.ESTIMATED)
    single()
    order("user_id", Order.ASCENDING, referencedTable = "users")
    csv()
    geojson()
    explain(analyze = true)
    filter {
        eq("id", 1)
    }
}
println(result.data)
println(result.decodeSingle<Message>())
println(result.countOrNull())
println(result.headers)

Additional context

Add any other context or screenshots.

[dshukertjr]

Love the new syntax! Thanks for this update!