chore(actions): Adds labeler Action to automatically add labels on PR:s

[ViacheslavKudinov]

Resolves #2865

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Before the change?

• Prior to this change a lot manual work for maintainers to set labels to get well organised release notes

After the change?

• ✅ Adds GitHub Actions workflow that runs the labeler action on PR events
• ✅ Adds configuration file defining labeling rules based on branch names and file patterns. File adds labels based on chnaged files or/and based on names of the branches (we may introduce naming convention when we see it works well).

Config can be adjusted in the future according to our workflow.

PS Potentially could support labeling based on PR title actions/labeler#55

Pull request checklist

• Schema migrations have been created if needed (example)
• Tests for the changes have been added (for bug fixes / features)
• Docs have been reviewed and added / updated if needed (for bug fixes / features)

Does this introduce a breaking change?

Please see our docs on breaking changes to help!

• Yes
• No

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