Consider adding support for Webpack-bundled projects

[keturiosakys]

Currently any/all Webpack supports will by default fail at build time as Webpack attempts to resolve Node-native libraries regardless that they're guarded for Node-only use. The Node-native libraries are: stream-http, url (used in the Prometheus Exporter that is bundled) and async_hooks that is used in the library itself.

The issue can be worked around by manually installing and setting up polyfills as documented in #40 and/or probably setting resolve.fallback values to false for the afore-mentioned Node-native libraries. However that is somewhat brittle, and will not work with a default create-react-app config.

We should investigate supporting Webpack without extra configuration if we're looking to support client-side Autometrics.

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This is the full error that shows:

Module not found: Error: Can't resolve 'http' in '<USR_PATH>/react-repro/node_modules/@opentelemetry/exporter-prometheus/build/src'
BREAKING CHANGE: webpack < 5 used to include polyfills for node.js core modules by default.
This is no longer the case. Verify if you need this module and configure a polyfill for it.

If you want to include a polyfill, you need to:
        - add a fallback 'resolve.fallback: { "http": require.resolve("stream-http") }'
        - install 'stream-http'
If you don't want to include a polyfill, you can use an empty module like this:
        resolve.fallback: { "http": false }
ERROR in ./node_modules/@opentelemetry/exporter-prometheus/build/src/PrometheusExporter.js 25:15-30
Module not found: Error: Can't resolve 'http' in '<USR_PATH>/react-repro/node_modules/@opentelemetry/exporter-prometheus/build/src'

BREAKING CHANGE: webpack < 5 used to include polyfills for node.js core modules by default.
This is no longer the case. Verify if you need this module and configure a polyfill for it.

If you want to include a polyfill, you need to:
        - add a fallback 'resolve.fallback: { "http": require.resolve("stream-http") }'
        - install 'stream-http'
If you don't want to include a polyfill, you can use an empty module like this:
        resolve.fallback: { "http": false }

ERROR in ./node_modules/@opentelemetry/exporter-prometheus/build/src/PrometheusExporter.js 28:14-28
Module not found: Error: Can't resolve 'url' in '<USR_PATH>/react-repro/node_modules/@opentelemetry/exporter-prometheus/build/src'

BREAKING CHANGE: webpack < 5 used to include polyfills for node.js core modules by default.
This is no longer the case. Verify if you need this module and configure a polyfill for it.

If you want to include a polyfill, you need to:
        - add a fallback 'resolve.fallback: { "url": require.resolve("url/") }'
        - install 'url'
If you don't want to include a polyfill, you can use an empty module like this:
        resolve.fallback: { "url": false }

ERROR in ./node_modules/@autometrics/autometrics/dist/index.mjs 53:12-33
Module not found: Error: Can't resolve 'async_hooks' in '<USR_PATH>/react-repro/node_modules/@autometrics/autometrics/dist'