Remove timeDuration

[endorama]

Following up on discussion in #62 this PR removes timeDuration helper function.

The same functionality is provided by sprig. This:

{{$startOffsetDuration := timeDuration $startOffsetInSecond}}

becomes

{{$startOffsetDuration := $startOffsetInSecond | int64 | duration}}

[elasticmachine]

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• Start Time: 2023-03-21T09:58:26.234+0000

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[aspacca]

$startOffsetInSecond was indeed $startOffsetInNanosecond (my bad :))
$startOffset was multiplied 1000000000 because our timeDuration expected nanoseconds, duration from sprig expects seconds: so we need to use directly the value in $startOffset (still multiplied by -1 since we want to subtract the value) is already the correct one.
Not sure if you prefer a oneliner or not, but this might work as well:

{{- $start := mul -1 $startOffset | int64 | duration | $end.Add }}

[endorama]

Thanks for noticing, I completely missed that.
I updated the template.

[aspacca]

my oneliner was wrong:
time.Time.Add takes a time.Duration, but duration returns a string, so we must use dateModify from sprig

{{- $start := $end | dateModify  (mul -1 $startOffset | int64 | duration) }}

todo: let's add to CI to generate at least one event for all the templates