feat: Test severity

[adityathebe]

Resolves: #370

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[moshloop]

duration should be appended into the default check results object e.g. for a junit it might be:

test:
   threshold:
       high: duration > 10000 || failed / passed > 0.1
       warning: duration >20000 || failed / passed > 0.02
       info: duration >20000 || failed / passed > 0.01

[adityathebe]

canary-checker/checks/runchecks.go

Lines 89 to 92 in da453a8

	func processTemplates(ctx *context.Context, r *pkg.CheckResult) *pkg.CheckResult {
	if r.Duration == 0 && r.GetDuration() > 0 {
	r.Duration = r.GetDuration()
	}

Duration is added to the check result object at the top of the func