Add aws-kotlin-jvm-maven template

[RafalWilinski]

What did you implement:

Closes #3883

Adds Kotlin template. It uses JVM and Maven under the hood. Support for gradle based is coming soon.

I'm also willing to investigate Kotlin -> JS compilation so it might run using node6.10 runtime.

How can we verify it:

serverless create -t aws-kotlin-jvm-maven
serverless deploy

It's also compatible with #4199 so you can use invoke local too.

Todos:

• Write tests
• Write documentation
• Fix linting errors
• Make sure code coverage hasn't dropped
• Provide verification config / commands / resources
• Enable "Allow edits from maintainers" for this PR
• Update the messages below

Is this ready for review?: YES
Is it a breaking change?: NO

[pmuens]

Great addition @RafalWilinski 👍

Just added a comment about the template naming. Haven't tested it yet, but will do so in the upcoming days.

There are still some other things which needs to be added / updated. Best way to find them is to run a global search for aws-python3.

Let us know if you need any help here 💪

[pmuens]

The current naming convention is provider-language/runtime-buildenv.

Maybe we should rename the template to aws-kotlin-maven (since AFAIK AWS uses the jvm behind the scenes)?

[RafalWilinski]

I've added JVM part because Kotlin can compile to Java (JVM) or JS (Node.js). In future, I wanted to add also Kotlin -> JS, hence the name. Node.js option might be even more viable because of much faster initial start time vs JVM.

[RafalWilinski]

Thanks for review. I totally overlooked other things, sorry for that! Fix incoming

[eahefnawy]

@RafalWilinski thanks a lot for that! Does this template work with your Invoke Local Java PR?

Looks good 👍 Nothing to add 😊

[RafalWilinski]

Yes, It works with invoke local for Java.

[pmuens]

Thanks for updating the PR @RafalWilinski 👍

Just tested this template today and it's working great 💪! Good job 💯 (as usual!) --> Merging

[pmuens]

I'm also willing to investigate Kotlin -> JS compilation so it might run using node6.10 runtime.

BTW @RafalWilinski that would be super nice ☝️ 💯