Adding benchmarks for Karapace 4 and 5

[muralibasani]

About this change - What it does

Under benchmarks dir, we have new scripts which

• creates 100 topics
• produces 50k messages over rest proxy
• consumes 50k messages over rest proxy
• Writes results to a csv file

Added results for karapace 4 and 5 versions.

References: #xxxxx

Why this way

[github-actions]

Coverage report

Click to see where and how coverage changed

File	Statements	Missing	Coverage	Coverage (new stmts)	Lines missing
src/karapace/core/coordinator
schema_coordinator.py
Project Total

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[nosahama]

Ideally there should be no difference in performance between rest-proxy v4 and v5 as majority of the code changes were for SR, but then rest-proxy uses schema-registry and that implementation changed.
While i still review the PR, I start to now suspect all the logic we have loaded the API middleware with, content-type checks, authentication, telemetry, all those will definitely add "slight" (needs verification) latency.

[muralibasani]

Ideally there should be no difference in performance between rest-proxy v4 and v5 as majority of the code changes were for SR, but then rest-proxy uses schema-registry and that implementation changed. While i still review the PR, I start to now suspect all the logic we have loaded the API middleware with, content-type checks, authentication, telemetry, all those will definitely add "slight" (needs verification) latency.

@nosahama can you may be also run these scripts on your pc for 4 and 5 versions, just to compare?