Ability to define multiple directories for Lambda construct

[efimk-lu]

Hello,
Great framework, keep up the good work.

Right now in order to define a lambda construct 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 preprocess step before actually running cdk deploy, it would be cleaner to do it as part of the lambda configuration.

[spg]

I'm totally for this. Also, I like how Serverless has implemented this https://serverless.com/framework/docs/providers/aws/guide/packaging#exclude--include

It would be nice to be able to include/exclude files and directories using glob patterns.

[SomayaB]

Duplicate of #984