AWS::Lambda::Function inlineCode support for Ruby

### Name of the resource

AWS::Lambda::Function

### Description

Manually creating a Lambda function in AWS allows you to pick from NodeJS, Python, Ruby, and some others. As it stands for CloudFormation templates, AWS::Lambda::Function can not have the property `Runtime: ruby2.7` (or older versions) and use inline code via the property:
```YAML
Code:
ZipFile: |
# code
```

This issue https://github.com/aws-cloudformation/cloudformation-coverage-roadmap/issues/80 has garnered enough attention that I believe it is worthy of implementing inline Ruby code if possible.