Pass context to fetch in json-schema loader (used in new-openapi handler)

[dr3]

Is your feature request related to a problem? Please describe.

In the previous open-api handler we had access to context in our fetch function, which gave us access to a few things, for our usecase this was primarily context.request.log which we used for logging.

Describe the solution you'd like

Passing context to fetch when its invoked

Describe alternatives you've considered

n/a

Additional context

The old openapi handler approach
The new fetch call

[dr3]

Started draft PR, which functionally solves the problem, however this would require moving from the native fetch type to something more akin to the one in the openapi handler so a different approach may be preferable

[ardatan]

customFetch function takes context as a third parameter. Let us know if this doesn't work.
https://github.com/Urigo/graphql-mesh/blob/master/packages/types/src/index.ts#L165