fix: browser support without bundler/browserify

[bill-min]

Check issue here: browserify/node-util#62

It throws error process is not defined if bundler does not handle it when used in browser.

[mtth]

avsc historically didn't support browser builds without a bundler. This would be a reasonable feature request, but we should do it cleanly (e.g. remove bundler related files and configurations).

[bill-min]

If you check the node-util issue, ppl already complained that vite/webpack5/esbuild doesn't polyfill process anymore, which is what most ppl use nowadays. Its kinda weird that util sits under browserify but named node-util while the maintainer doesn't want to support browser compatibility at all...

[bill-min]

Let me know what you think @mtth, I am happy to tweak the PR and/or refactor properly if we are aiming for the fix.

[mtth]

I'm leaning towards removing debuglog altogether - would you mind updating the PR (types.js and the 2 platform.js files)?

[bill-min]

#486