Make use of System.Text.Json.Utf8JsonWriter in Traditional bridge serialization

v11 of Synergy added support for a subset of System.Text.Json. performance testing indicates this is upwards of 10x faster than the prior solution. We need to take advantage of the new runtime features but should remain backwards compatible with earlier runtime versions.

Aha! Link: https://synergex.aha.io/features/HC-24