Add support for prepending custom path to source map file property

[eskirk]

some users have encountered an issue when using a CDN or CMS where the stacktrace file path differs from the path in the source map, leading to a failure to decode the stacktrace.

this feature would either:

1. provide documentation for how to debug and handle this situation
2. provide a "prefixPath" property in the bundler in order to prepend arbitrary strings in order to match the errors (similar to the solution for _nextjs)

[pklam]

Triaging with Renata. This is a feature request - there is a source maps enhancement
https://grafana-labs.aha.io/features/FEO11Y-62 that I will link in Aha.