Add Deno example

[markmals]

As of version 2.2, Deno supports the requisite compilerOptions keys to enable React Router typegen types to work in Deno, so I think it's time for a Deno template! There are still a few rough edges here, but I think they're fairly low-hanging fruit to fix in the core RR codebase to make React Router an excellent choice for Deno applications. Here's what still needs work:

• The requested module 'react-dom/server' does not provide an export named 'renderToPipeableStream'
  • react-dom/server has export shims for "node" and "edge" platforms, but renderToPipeableStream is only exported for the "node" shims. To make this work, I'm currently manually patching the react-dom/server import using sed to change it to react-dom/server.node as part of the build task pipeline. Edit: I've replaced the separate "patch-build" task in favor of a Vite resolve.alias entry.
• Failed resolving binary export. '/Users/orion/Developer/Templates/react-router-templates/deno/node_modules/.deno/[email protected]/node_modules/react-router/package.json' did not have a bin property
  • When trying to run the React Router binary with Deno (deno run -A npm:react-router typegen), you currently get this error. To work around this, I'm running the React Router binary using its absolute path (deno run -A ./node_modules/.bin/react-router typegen).
• I could not figure out how to pass anything besides await import("../build/server/index.js") to createDenoRequestHandler without the production build crashing. I tried passing virtual:react-router/server-build to it and that didn't work (the file runs outside of Vite). I tried passing a ServerBuild object with a getLoadContext, I tried passing the promise without awaiting it, I tried passing the promise wrapped in a function. Nothing worked, so this means no Load Context example for Deno (not sure how much this matters with middleware coming soon, which I haven't tried to make work in Deno yet).
• Could not find package.json in react-router-templates/deno or any of its parent directories
  • A package.json file is unnecessary for this Deno setup, however without one when trying to run react-router dev it crashes.
• Could not determine server runtime. Please install @react-router/node, or provide a custom entry.server.tsx/jsx file in your app directory.
  • If you add a package.json without specifying dependencies (since all dependencies are specified in deno.jsonc), you get this error.
• adding isbot@5 to your package.json, you should commit this change
  • If you specify the @react-router/node dependency in package.json, then you get the this warning and react-router dev uses npm to install isbot, which has already been installed by Deno.
• I've added a stub package.json file with the necessary package specifications to get react-router dev working without complaining, but it would be ideal to not need a package.json at all.
• The build.target key in vite.config.ts needs to be set to "ESNext" to silence errors about top-level await.
• The resolve.alias key in vite.config.ts needs to be manually set, because there is no tsconfig.json for vite-tsconfig-paths to operate on.

[jacob-ebey]

Thanks for the PR. I've simplified it a bit and got it merged here: #131