Send Pacing Offload

[nibanks]

Describe the feature you'd like supported

Pacing sends can be quite CPU intensive and OS timers aren't accurate enough for many scenarios, resulting in too much burstiness. We should add HW support for this.

Proposed solution

Work with hardware partners to standardize https://github.com/microsoft/net-offloads/blob/main/time-based-packet-transmission-offload.md, and implement in MsQuic.

Additional context

No response