chore: WPGraphQL v1.9.x connection resolver support added and autoloader removed.

[kidunot89]

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What does this implement/fix? Explain your changes.

• Composer autoloader no longer used to load plugin files
• WPGraphQL v1.9.x connection resolver support added.
• PHPCS rules updated and compliance met. (Bye bye old style array() and hello short syntax [ ])

Does this close any currently open issues?

…

Any relevant logs, error output, GraphiQL screenshots, etc?

(If it’s long, please paste to https://ghostbin.com/ and insert the link here.)

Any other comments?

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Where has this been tested?

• WooGraphQL Version: …
• WPGraphQL Version: …
• WordPress Version:
• WooCommerce Version:

[codeclimate]

The PR diff size of 12649 lines exceeds the maximum allowed for the inline comments feature.

[codeclimate]

There are too many results to compare

The test coverage on the diff in this pull request is 57.7% (50% is the threshold).

This pull request will bring the total coverage in the repository to 76.4% (-1.3% change).

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