Structured Design Context in Synthesized Templates

[satyakigh]

Description

Adds AWS CDK APIs for resource- and template-level structured design context under
com.aws.cloudformation.Context in synthesized CloudFormation templates. See RFC pull
request #981.

Roles

Role	User
Proposed by	@satyakigh
Author(s)	@satyakigh
API Bar Raiser	@iliapolo
Stakeholders	TBD

See RFC Process for details

Workflow

• Tracking issue created (label: status/proposed)
• API bar raiser assigned (ping us at #aws-cdk-rfcs if needed)
• Kick off meeting
• RFC pull request submitted (label: status/review): #981
• Community reach out (via Slack and/or Twitter)
• API signed-off (label status/api-approved applied to pull request)
• Final comments period (label: status/final-comment-period)
• Approved and merged (label: status/approved)
• Execution plan submitted (label: status/planning)
• Plan approved and merged (label: status/implementing)
• Implementation complete (label: status/done)

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Author is responsible to progress the RFC according to this checklist, and
apply the relevant labels to this issue so that the RFC table in README gets
updated.