Add pacing to smooth the flow of packets sent onto the network

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 93.22034% with 8 lines in your changes missing coverage. Please review.

Project coverage is 95.39%. Comparing base (e783212) to head (2d26e9a).

Files	Patch %	Lines
src/connection/connection.rs	65.21%	8 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## develop #284 +/- ## =========================================== + Coverage 95.37% 95.39% +0.02% =========================================== Files 50 50 Lines 33482 33545 +63 =========================================== + Hits 31932 32000 +68 + Misses 1550 1545 -5 ```

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