chore(ci): automatically add area label based on title

[rubenfonseca]

Issue number: #1009

Summary

Changes

Automatically add the respective area label for known areas. The area is derived from the PR title.

User experience

When a contributor submits a PR, an area/xxx label should be automatically applied if the title mentions a known powertools area.

Checklist

If your change doesn't seem to apply, please leave them unchecked.

• Meet tenets criteria
• I have performed a self-review of my this change
• Changes are tested
• Changes are documented
• PR title follows conventional commit semantics

Is this a breaking change?

RFC issue number:

Checklist:

• Migration process documented
• Implement warnings (if it can live side by side)

Acknowledgment

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[rubenfonseca]

@heitorlessa I don't feel confortable having an array of areas in the JS files. Is there a central place anywhere in the repository where we have the canonical list of areas that we could reference instead?

[heitorlessa]

another papercut crossed from the list o// Thank you!! Tiny typo on metric vs metrics only

[heitorlessa]

Closest we've got now is our new constants.js: https://github.com/awslabs/aws-lambda-powertools-python/blob/develop/.github/scripts/constants.js

One of the work we should do is to standardize a baseline of labels (90% there) across all Powertools, then make sure they not only stay in sync but is also available across repos to fetch and use in any automation. We don't have that yet.

[rubenfonseca]

I've pulled the known areas into a constant on constants.js

[boring-cyborg]

Awesome work, congrats on your first merged pull request and thank you for helping improve everyone's experience!