The '@theia/bunyan' extension to be removed

The @theia/bunyan extension is soon to be removed from the main repository as it seems to be outdated, unused by any other package (including both app targets) and consequently is untested. If anyone would like to reference the extension or use it as an example for other logging extensions it is enough to look at the repository’s history. The same is true if someone wants to extract it into it’s own repo and maintain it.

[original thread by Vince Fugnitto]

If there are no objections, Vince will merge the PR on Monday.