v2.4.0

Verify git tag on release (#347, @miry)
Fix MacOS 12 tests for go17 with -race flag (#351, @strech)
Rename testing/ and bin/ folders (#354, @strech)
Added verbose error on proxy upstream dialing (#355, @f-dg)
Improve server startup message (#358, @areveny)
Introduce yaml linter. (#362, @miry)
Handle slicer toxic with zero SizeVariation and fix slicing randomization (#359, @areveny)
Added /metrics endpoint for exposing Prometheus-compatible internal metrics (#366, @neufeldtech)

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