feat(instrumentation-aws-lambda): In AWS Lambda instrumentation, extend invocation span start time back to Lambda environment startup time on coldstart #2533
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Which problem is this PR solving?
Currently, AWS Lambda instrumentation doesn't take Lambda startup time into account while calculating invocation span start time on coldstarts. So, this behavior leads to reporting dramatically incorrect invocation span duration.
Short description of the changes
In this PR, Lambda environment start time is used as invocation span start time on coldstarts, so reported invocation span time also includes initialization time too.