devstats,repo_groups: generate repo_groups.sql

[dhiller]

What this PR does / why we need it:

CNCF devstats project provides dashboards for KubeVirt that show GitHub data 2. This PR is a required part to keep the repository groups of the user statistics by repository 3 in sync with the content of sigs.yaml. Another PR inside project-infra will change the job to use this tool.

This PR adds a go tool that generates SQL statements to update repository groups for CNCF devstats 1.

See #330 for more details.

Background

KubeVirt repository groups are updated with an SQL script 4 - we want these repository groups to be updated automatically whenever there's changes in our sigs.yaml.

A while ago we had decided to directly align our repository groups to the ownership references inside the sig definitions - in effect this maps any change in a repository to one or more SIGs.

When calling the tool, i.e.

go run ./robots/cmd/devstats/...

it generates SQL code that is targeted to update the kubevirt repo_groups

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Fixes #

Special notes for your reviewer:

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