feat(server): add --cors argument to enable cors for all workers

[Narayanbhat166]

This PR will add the support for configuring origins to enable CORS for all the workers. If the worker has setup Access-Control-Allow-Origin then it will be respected. Multiple origins can be passed using the --cors flag. This is a simple example

wws --cors https://example.com .

This will add https://example.com to all the workers who do not have Access-Control-Allow-Origin header configured. This can be tested out by the below curl command

curl http://127.0.0.1:8080/worker -i

HTTP/1.1 200 OK
content-length: 11
access-control-allow-origin: https://example.com
content-type: text/html
x-generated-by: wasm-workers-server
date: Mon, 28 Aug 2023 16:10:25 GMT

Hello wasm!

To enable all origins, wws can be run with the argument

wws --cors '*' .

Closes #46

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[Angelmmiguel]

Hey @Narayanbhat166!

Thank you very much for your contribution 🎉 . The code LGTM!

I'm gonna merge it right after tests passes. We will need to rebase this change into #185, as we're consolidating all app_data into a single structure. @ereslibre will consolidate it in that PR.

Thank you! 👏