Product and order connections queryClass set.

[kidunot89]

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What does this implement/fix? Explain your changes.

Sets the \WC_Product_Query class and WC_Order_Query class as the queryClass for the product and order connections.

Does this close any currently open issues?

Fixes #504
Fixes #569

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

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Any other comments?

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Where has this been tested?

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