Add Namespace and update deno serve

[nickchomey]

Fixes #12

Adds a namespace type. Its entirely possible this is not done correctly - i dont quite understand how it all works. It is a good start though.

Also updates the archaic version of deno serve with the latest api.

I did run

deno run -A build.ts 
./test/run-all.sh

and it all passed.

But, as was noted in #12, there's no tests for namespace...

[Copilot]

Pull request overview

Adds RC7 namespace support to patchElements in the TypeScript SDK and updates Deno examples/tests to use the modern Deno.serve API.

Changes:

• Introduces DatastarDatalineNamespace, NamespaceTypes, and NamespaceType, and wires namespace into PatchElementsOptions.
• Adds runtime validation for the namespace option in ServerSentEventGenerator.patchElements.
• Updates Deno test/example servers to use Deno.serve and forwards namespace through the test event harnesses.

Reviewed changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
test/node.ts	Forwards namespace from test event payloads into patchElements options.
test/deno.ts	Migrates to Deno.serve and forwards namespace into patchElements options.
test/bun.ts	Forwards namespace from test event payloads into patchElements options.
src/types.ts	Adds NamespaceType and types PatchElementsOptions.namespace.
src/consts.ts	Adds DatastarDatalineNamespace and NamespaceTypes.
src/abstractServerSentEventGenerator.ts	Validates namespace and documents it in patchElements options.
examples/deno/deno.ts	Migrates example server to Deno.serve.

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[cameronapak]

Hey, checking in on this. The code looks good. What remains for this to be merged?