Allow use of Ref, Fn::GetAtt and Fn::ImportValue in awsKmsKeyArn

[tume]

Allows to use Ref, Fn::GetAtt or Fn::ImportValue in awsKmsKeyArn config.

My first PR to this project so not sure how good approach this is but tried to mimic stuff that already exists.

I'm mainly interested in Fn:GetAtt and Fn::ImportValue in my own project but used the ready-made function which now also supports the Ref. Not sure if needed here?

Modified error message a bit and added a couple of simple test cases.

Closes #7057

How can we verify it

service:
  name: test-service
  awsKmsKeyArn: !GetAtt ['MyKmsKey', 'Arn']

resources:
  Resources:
    CustomKmsKey:
      Type: "AWS::KMS::Key"
      Properties:
        KeyPolicy:
          Version: "2012-10-17"
          Id: "CustomKmsKey"
          Statement:
            - Sid: "Enable IAM User Permissions"
              Effect: "Allow"
              Principal:
                AWS: <aws account_id>
              Action:
                - "kms:*"
              Resource: "*"

Todos

Useful Scripts

• npm run test:ci --> Run all validation checks on proposed changes
• npm run lint:updated --> Lint all the updated files
• npm run lint:fix --> Automatically fix lint problems (if possible)
• npm run prettier-check:updated --> Check if updated files adhere to Prettier config
• npm run prettify:updated --> Prettify all the updated files

• [ X ] Write and run all tests
• Write documentation
• [ X ] Enable "Allow edits from maintainers" for this PR
• [ X ] Update the messages below

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

[codecov-io]

Codecov Report

Merging #7083 into master will increase coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #7083      +/-   ##
==========================================
+ Coverage   88.63%   88.63%   +<.01%     
==========================================
  Files         231      231              
  Lines        8479     8481       +2     
==========================================
+ Hits         7515     7517       +2     
  Misses        964      964

Impacted Files	Coverage Δ
lib/plugins/aws/package/compile/functions/index.js	95.9% <100%> (+0.03%)	⬆️

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[medikoo]

Great thanks @tume, looks good