feat (aws-lambda): Write multiasset function to select diffrent folders as lambda asset

[ahzia]

Motivation: Right now in order to define a lambda function you need to set where the code resides, e.g. code: lambda.Code.asset('lambda'). Sometimes you would like to define multiple folders, for example, the actual code and node_modules, although packing can be done as a preprocessing step before actually running CDK deploy, it would be cleaner to do it as part of the lambda configuration.
This was future was requested by many users in Issue 984
Design aspect:
added a new function fromMultiAsset which takes an array of paths and archives it inside a zip file, then it calls AssetCode() and passes this new file.
The codes for Archive functions come from how it been done in cdk-assets Package

closes #984

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[kai-ten]

@ahzia , need any help getting this to the finish line? This is a great feature