feat: Support custom context

[alberthuang24]

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Description

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Fixes #2856

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[ardatan]

Thank you for your PR!
We're currently thinking of using Envelop to extend Mesh's capabilities. So I believe Envelop's context related plugins will probably solve this issue in more generic way.
I'll let you know so you can test it with the alpha versions.

[ardatan]

You can use envelop plugins to extend the context as described in here;
https://www.graphql-mesh.com/docs/getting-started/customize-mesh-server#configure-and-provide-envelop-plugins

Thanks for the PR anyway :)