Use Github Action for CI/CD

[dplewis]

New Issue Checklist

• [x] I am not disclosing a vulnerability.
• [x] I am not just asking a question.
• [x] I have searched through existing issues.
• [x] I can reproduce the issue with the latest version of Parse Server and the Parse PHP SDK.

Issue Description

This repo still uses travis ci. This means tests cases, coverage, releases, documentation, etc aren't being ran.

[parse-github-assistant[bot]]

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[dplewis]

Closing via https://github.com/parse-community/parse-php-sdk/pull/489