feat: allow user to provide role for schedule

[sidhujus]

Issue #, if available

feature request discussion #3290

Description of changes

Add new Role property to Schedule for user to pass in their own role to be used with the generated event rule
Example

  MyStateMachine:
    Type: AWS::Serverless::StateMachine
    Properties:
      Definition:
        Comment: A Hello World example of the Amazon States Language using Pass states
        StartAt: Hello
        States:
          Hello:
            Type: Pass
            Result: Hello
            Next: World
          World:
            Type: Pass
            Result: World
            End: true
      Policies:
      - Version: '2012-10-17'
        Statement:
        - Effect: Deny
          Action: '*'
          Resource: '*'

      Events:
        CWSchedule:
          Type: Schedule
          Properties:
            Schedule: rate(1 minute)
            Description: test schedule
            Enabled: false
            Role: with-role-MyStateMachineCWScheduleRole-RI4SGRI1ORL9

Description of how you validated changes

Validated with tests and tansformed a template with the new Role property and succesfully deployed and had it execute the state machine

Checklist

• Adheres to the development guidelines
• Add/update transform tests
  • Using correct values
  • Using wrong values
• Add/update integration tests

Examples?

Please reach out in the comments if you want to add an example. Examples will be
added to sam init through aws/aws-sam-cli-app-templates.

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[GavinZZ]

nit: we usually name the PR
feat: xxxxx for feature request
fix: xxxxx for bug fix
chore: xxxxx for chore task

[GavinZZ]

Noticed that this currently only supports hardcoded Role arn. SAM generally supports both hardcoded RoleArn or intrinsics !Ref to a role resource.

[GavinZZ]

Great work!

[aaythapa]

great work