feat: add --open to deno serve to open server in browser #25340
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This PR addresses issue number #25149
Change:
Supported --open flag with deno serve -> (deno serve --open somescript.ts/js).
The action that takes place is openning the browser on the address that the server is running on.
Changes on code:
Concerns:
The window tab will be opened on deno serve command no matter whether deno serve succeeds or fails.
The added test since it's a serve command then it starts listening for a request and never shuts down, I couldn't figure out how to shut it down same as other serve tests.