Refactors plugin to modularize code and improve maintainability #10

Job	Run time
Discover Packages	6s
Release gatsby-source-github-graphql-discussions to NPM	8s
Release gatsby-source-github-graphql-sponsors to NPM	6s
Release gatsby-source-github-graphql to NPM	23s
Release gatsby-source-github-graphql-get-user to NPM	9s
Release gatsby-source-github-graphql-user-repos to NPM	8s
	1m 0s

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