Update codeowners with high granularity (#89)
Update codeowners with high granularity (#89)

## What is the goal of this PR?
Reviewing PRs in subpackages should be allowed to be merged by with just the primary codeowner's permission in specific cases.

## What are the changes implemented in this PR?
* Made granular codeowner permissions per file and folder
* make @flyingsilverfin reasoner codeowner
* make @lolski  BUILD file owner
lolski/grakn,graknlabs/grakn,lolski/grakn,graknlabs/grakn,graknlabs/grakn,lolski/grakn,lolski/grakn,graknlabs/grakn