feat(aws-cloudfront-mediastore): new aws-cloudfront-mediastore pattern implementation

[beomseoklee]

Issue #, if available: #104

Description of changes:
This PR introduces a new pattern which can be used by live streaming solutions. The pattern creates an Amazon CloudFront distribution whose origin is an AWS Elemental MediaStore container.

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[aws-solutions-constructs-team]

AWS CodeBuild CI Report

• CodeBuild project: codebuildgithubautobuildPro-rp7jMDIK1wBN
• Commit ID: 5ebf8e9
• Result: FAILED
• Build Logs (available for 30 days)

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[beomseoklee]

To build source/tools/cdk-integ-tools, it seems like the latest yargs returns argv as string[] or number[] so the CodeBuild failed. If you are OK, I'll update cdk-integ.ts file.

Currently,

aws-solutions-constructs/source/tools/cdk-integ-tools/bin/cdk-integ.ts

Line 16 in fa702cc

const tests = await new IntegrationTests('test').fromCliArgs(argv._);

And update would be

const tests = await new IntegrationTests('test').fromCliArgs(<string[]>argv._);

Let me know your thought.