Perf test organization

[gabo1208]

Changes

• 🐛 Fixed wrong performance values in sender throughput graph that were really its latency
• 🧹 Added sender throughput graph
• 🧹 Bettter organization for tests and docs
• 🧹 Added source basic arch diagram

/kind enhancement

Release Note

Now the docs are better organized and performance tests graphs are correct

[codecov]

Codecov Report

Merging #721 (880bdbd) into main (81984b2) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #721   +/-   ##
=======================================
  Coverage   75.38%   75.38%           
=======================================
  Files          32       32           
  Lines        2397     2397           
=======================================
  Hits         1807     1807           
  Misses        523      523           
  Partials       67       67           

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[salaboy]

@gabo1208 perfect! this is great.. having the contributing md file is perfect.. we should merge before this get stale.. sorry for the delay in reviewing!

[knative-prow]

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