Since it was added, we never maintained the file leading to decay in the
set of "actual" code owners. In practice, the current set up ends up
assign most reviews to 2 or so active contributors. I think the idea
itself is sound, but the current implementation leads to certain
reviewers being over-assigned PRs, which at times causes those PRs to
stagnate since pretty much every PR gets assigned to the same set of
people.
In this commit, we create the initial CODEOWNERS file for `lnd`. This
file is a new-ish feature of Github that allows the maintains of a
project to define the individuals who are deemed to be experts of a
particular section of the codebase. Automated review assignment systems
can then use this file to generate required reviewers for a section of
the project. The CODEOWNERS file isn't meant to be a strict guideline,
but instead can be used to ease the burden of finding reviewers for a
particular section of the codebase.
It's also possible to enforce that the CODEOWNERS for a particular
file/package sign-off on relevant changes, thereby blocking review
unless they're involved. However, for now we'll simply use it to guide
the review assignment project, leaving creating blocking review
constraints until a later point if deemed useful.
