monitorScope always create latency alarm for lambda based on timeout value

[AminFazlMondo]

Feature scope

Lambda

Describe your suggested feature

The latency alarms can be added to lambdas on static value at the moment.
It would be great to set this to alarm on percentage of the lambda timeout value.
This is more important when we want to monitor scope and create alarm for all lambdas within the scope using monitorScope, and each lambda has it own timeout and not one duration value fits all.