feat(schema): Support condition properties in resources

[jpinkney-aws]

Issue #, if available:
Related aws-toolkit-vscode issue: aws/aws-toolkit-vscode#1978

Description of changes:
This PR adds in support for condition properties in resources, essentially allowing something like:

Resources:
  MountPoint:
    Type: "AWS::EC2::VolumeAttachment"
    Condition: CreateProdResources
    Properties:
      InstanceId: !Ref EC2Instance
      VolumeId: !Ref NewVolume
      Device: /dev/sdh

from the aws documentation to be valid in JSON.

The above example was taken from: https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/conditions-sample-templates.html

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[github-actions]

🎉 This PR is included in version 6.4.0 🎉

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