Add bugzilla backend

[stucchio]

It would be great if idli could connect to the bugzilla backend.
Bugzilla appears to have a REST API, so it shouldn't be that hard.
https://wiki.mozilla.org/Bugzilla:REST_API

[stucchio]

Bugzilla REST api docs:

https://wiki.mozilla.org/index.php?title=Bugzilla:REST_API&oldid=255910

https://wiki.mozilla.org/index.php?title=Bugzilla:REST_API:Methods&oldid=255909

https://wiki.mozilla.org/Bugzilla:REST_API:Objects#Bug

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