option to set location for sourcemaps (for console logs)

Ok so to get sourcemaps fully working with Sentry, i have to modify quite a few things:

• change the location of sourcemaps (like with hidden sourcemaps)
• force sourceMappingURL to follow the format app:///bundle.js.map (so no mention to the relative path where source maps are located).

Consequently sourceMapConverter will fail here because this is the wrong location. I guess it tries to find the sourcemap in the same dir as the source itself. Or even what does it do with app:///

Do you think it would be possible to define somewhere (project wise) the location of the sourcemaps. May be using https://github.com/thlorenz/convert-source-map#frommapfilecommentcomment-mapfiledir ?

先閱讀 lib/services/log-source-map-service.ts 中呼叫 sourceMapConverter 的位置，並追蹤 console-log 的 sourcemap 位置如何解析。檢查 issue 中對 convert-source-map 的參照，以及專案現有的設定路徑。當專案層級的 sourcemap 位置能夠支援所要求的 Sentry app:///bundle.js.map 格式，同時不會破壞來源查找時，即表示完成。