feat: allow setting a new execution result via the onResultProcessHook

[n1ru4l]

From #graphql-yoga discord:

[01:20] marais: how do we set a custom pattern for responses?
[01:20] marais: as in, i dont want yoga to always create json responses, i need it to be multipart of defer/stream

This currently requires adding a setResult API within the experimental onResultProcess hook. (EDIT: see comment below.)
We can make this more straight-forward to use in v3

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Latest commit: 2aa2b87

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@graphql-yoga/common	Minor
@graphql-yoga/node	Minor
@graphql-yoga/render-graphiql	Major
cloudflare-advanced	Patch
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sveltekit	Patch
apollo-federation-gateway-with-yoga	Patch
apollo-subgraph-with-yoga	Patch
graphql-lambda	Patch
defer-stream-example	Patch
error-masking-example	Patch
express-example	Patch
fastify-modules-example	Patch
fastify-example	Patch
file-upload-nextjs-pothos	Patch
file-upload-nexus	Patch
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example-generic-auth	Patch
graphql-ws	Patch
hackernews	Patch
hello-world	Patch
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nextjs-auth	Patch
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[n1ru4l]

Edit: I just noticed that the result can already be "overwritten" within onExecute.onExecuteDone

See https://codesandbox.io/s/yoga-enforce-specific-protocol-64p8h8?file=/README.md

@ardatan What do you think should we still allow overwriting it within onResultProcessHook?

[n1ru4l]

Closing as this can already be done via https://codesandbox.io/s/yoga-enforce-specific-protocol-64p8h8?file=/README.md