feat: bun server with graphql examples

[sumcoding]

Issue #, if available:
N/A
Description of changes:

Currently there is no implementation of using the lambda web adapter to serve a graphql api backend. Nor one for bun.
This PR adds 2 examples using Bun server and yoga

• streaming via lambda url and graphql subscriptions via bun
• basic graphql api functionality via the api gateway via bun

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[mxfactorial]

this is a node server demo repeating the dependency in the express example

admittedly, so is the @sveltejs/adapter-node -> sveltekit -> polka -> http example

but the leap from lambda to ssr is longer

[sumcoding]

Fair point. I initially focused on GraphQL since it's popular tech that many developers are interested in, especially since this adapter I think makes it smoother to run on AWS. But you're right - it was essentially just another Node server example.

I've switched it to use Bun instead (while keeping the GraphQL parts), which was not a server I saw an example for yet.

[mxfactorial]

no objections to a merge

just nudging harold to start considering limiting lib examples because

❯ ls -1 examples | wc -l | xargs
42

risks inviting more questions about libs instead of a lambda event -> http request adapter

[bnusunny]

Yeah, I understand this. Patching so many examples become a bit work by itself. We may split the examples to a seperate repo in aws-samples.

[bnusunny]

@sumcoding Thanks for such a nice example for both Bun and GraphQL!