Set Default Values to Construct Properties using PropertyInjector

[pcheungamz]

Description

We would like to propose a framework for organizations to set default values to Construct Properties such as BucketProps.

Key Components:

• IPropertyInjector - has constructFqn and and inject function that takes in the original BucketProps and returns a BucketProps.
• PropertyInjectors - A collection of IPropertyInjectors. There is only one IPropertyInjector for a Construct. We can attach PropertyInjectors to any Construct, but the typical use case is to set PropertyInjectors on App, Stage, or Stack.
• applyInjectors - Constructs such as Bucket will call applyInjectors in their constructors to get the new BucketProps. It calls findInjectorsFromConstruct to find the correct injector to apply to the properties.
• findInjectorsFromConstruct - This starts from the Construct's parent Node and walk up the Tree to find an IPropertyInjector applicable to this Construct.
• Constructs that support Property Injection will need a FQN and call applyInjectors.

With this PropertyInjector Framework, organizations can set default properties for builders that meet their security bars.

Roles

Role	User
Proposed by	@pcheungamz
Author(s)	@pcheungamz
API Bar Raiser	@rix0rrr
Stakeholders	@pcheungamz, @manan-pancholi

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)
• 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-comments-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)

---

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.