Performance tests Go-native tool

[cardil]

Rewrite performance-tests.sh script (https://github.com/knative/hack/blob/main/README.md#using-the-performance-testssh-helper-script) into a Golang tool knative.dev/toolbox/performance.

Invent new Go-native extension interface, for example:

# will look for Go files with `perf` build constraints, that register configuration
go run knative.dev/toolbox/performance@latest

An example configuration might look like:

//go:build perf
package serving

import (
  "fmt"
  "os"

  // Implemented with `github.com/bitfield/script` or similar
  "knative.dev/pkg/kscript/ko"
  "knative.dev/toolbox/performance/pkg/config"
)

init {
  config.Configure(config.Config{
    Dir: "test/perf/bench", # default is "test/performance/benchmarks"
    UpdateKnative: function(ctx config.Context) error {
      ctx.LogProgress("Updating serving")
      return ko.Apply("config")
    },
    UpdateBenchmark: function(ctx config.Context, benchmark string) error {
      ctx.LogProgress(fmt.Sprintf("Updating benchmark $1", benchmark))
      return ko.Apply(fmt.Sprintf("%s/%s, ctx.Dir, benchmark))
    },
  })
}

[mgencur]

Same question as #19 (comment) , it also applies to this issue.

[github-actions]

This issue is stale because it has been open for 90 days with no
activity. It will automatically close after 30 more days of
inactivity. Reopen the issue with /reopen. Mark the issue as
fresh by adding the comment /remove-lifecycle stale.

[cardil]

/reopen
/remove-lifecycle stale
/triage accepted

[knative-prow]

@cardil: Reopened this issue.

In response to this:

/reopen
/remove-lifecycle stale
/triage accepted

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