Werk #12822: AWS Lambda performance: added metrics for cold starts and init duration

Component	Checks & agents
Title	AWS Lambda performance: added metrics for cold starts and init duration
Date	Aug 5, 2021
Level	Trivial Change
Class	New Feature
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.1.0b1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

The following additional metrics will be monitored by the AWS Lambda Performance check: * init duration * number of cold starts

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