Create LocalStack feature

[lakkeger]

Motivation

DevContainers giving the option to add so called Features which are building blocks users can add to their DevContainer Template/Collection/Environment. This would be a nice simple addition for any user who’d like to include LocalStack CLI and tools but doesn’t want to rely on our Template.

Changes

• Implemented capabilities:
  • install LocalStack CLI
  • allow only a list of values
    • latest
    • lts
    • stable
    • none
    • ""(empty)
    • 3.5.0
    • 3.4.0
    • 3.3.0
    • 3.2.0
    • 3.1.0
    • 3.0.2
    • 3.0.1
  • install awscli-local
  • install aws-cdk-local
  • install terraform-local
  • install pulumi-local
  • install aws-sam-cli-local
  • install dependencies via OS packages
  • install dependencies via pip
  • add other features to installAfter
• Implemented tests:
  • install with version:latest with OS package
  • install with version:lts with OS package
  • install with version:stable with OS package
  • install with version:none with OS package
  • install with version:empty with OS package
  • install with specific version
  • install with python
  • install with python on python image
  • install with OS package on python image
  • install one python based tool
  • install one node based tool relying on the node feature
  • install multiple tools relying on other features
• Adjust CI
• Clean up original examples
• Add new README

[pinzon]

LGTM