added cloudevents to events-storage

[cumason123]

Signed-off-by: Curtis Mason [email protected]

Description

Fixes #4531

Note: It's a good idea to open an issue first for discussion.

Checklist

• [*] I have followed Sample Guidelines from AUTHORING_GUIDE.MD
• [*] README is updated to include all relevant information
• [*] Tests pass: nox -s py-3.6 (see Test Environment Setup)
• [*] Lint pass: nox -s lint (see Test Environment Setup)
• These samples need a new API enabled in testing projects to pass (let us know which ones)
• These samples need a new/updated env vars in testing projects set to pass (let us know which ones)
• Please merge this PR for me once it is approved.
• This sample adds a new sample directory, and I updated the CODEOWNERS file with the codeowners for this sample

[grant]

LGTM!

[google-cla]

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[leahecole]

Author was an intern when they wrote the code and. had signed the CLA