Add PriceClass variable so that it is configurable (V2)

[andylamp]

Description

This PR adds a price_class variable so that the respective CDN optimization can be set within the scope of the CloudFront distribution being created. Currently this is not supported and its value is hardcoded to some regions (instead of all).

Additionally, it allows the configuration of the cache policy that the distribution will use as this is currently this is not supported.

This PR addresses these limitations and introduces no breaking changes.

Context

Allow users to adjust the following parameters,

• Price class for their CloudFront distribution,
• Cache Policy of the created distribution.

Type of changes

• [ ] Refactoring (non-breaking change)
• [x] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would change existing functionality)
• [ ] Bug fix (non-breaking change which fixes an issue)

Checklist

• [x] I am familiar with the contributing guidelines
• [x] I have followed the code style of the project
• [ ] I have added tests to cover my changes
• [ ] I have updated the documentation accordingly
• [ ] This PR is a result of pair or mob programming

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• [x] I confirm that neither PII/PID nor sensitive data are included in this PR and the codebase changes.

[andylamp]

@Tomdango hope that resolves the history issued and this can merged as expected.

[Tomdango]

@andylamp Included the changes in #21 as GitHub still wasn't resolving the Git history properly. Also - one of the requirements of the repository is to have signed commits. Could you setup a GPG key in GitHub and sign your commits into this repository please?