[meta] be able to symbolicate profiles after capturing

The goal of this meta issue is to better define which tasks are needed to be able to symbolicate profiles after capturing and sharing. The goal is especially to be able to symbolicate profiles on a different computer.

Obviously this will be only possible for official builds.

* [x] Capture and display Firefox build ID in profiler UI #603
* [x] Symbolicate unsymbolicated profiles after loading them, if possible
* [ ] Allow sharing a non-symbolicated profile
* [ ] Allow capturing and sharing from the add-on directly -- this involves processing the profile as well

Anything missing ?

┆Issue is synchronized with this [Jira Task](https://mozilla-hub.atlassian.net/browse/FP-731)