Max per page

[dee-kryvenko]

Resolves #2557

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Before the change?

Added a new max_per_page configuration option to the provider block backed by GITHUB_MAX_PER_PAGE env variable as default fn.

After the change?

Current behavior remains backward compatible as the default is still set to 100.

Pull request checklist

• Tests for the changes have been added (for bug fixes / features)
• Docs have been reviewed and added / updated if needed (for bug fixes / features)

Does this introduce a breaking change?

Please see our docs on breaking changes to help!

• Yes
• No

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[dee-kryvenko]

I wanted to add it as a param to Config struct but the whole shenanigans with Config not being available in the runtime context and instead having the Meta() as interface{} and the casting - I am baffled what is going on in there, and didn't want to touch any of that. This should be safe enough since TF guarantees ConfigureContextFunc to be called thread safely.