Feat: New pull request template

[peaklabs-dev]

Changes:

• This PR adds a checklist for people opening PRs, so they do not forget important things.
• It also adds a changes and issues section, so we always know what the PR does and what issues are fixed. Also, we can easily copy the fixed issues to the release PR.

[gitguardian]

️✅ There are no secrets present in this pull request anymore.

If these secrets were true positive and are still valid, we highly recommend you to revoke them.
Once a secret has been leaked into a git repository, you should consider it compromised, even if it was deleted immediately.
Find here more information about risks.

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[andrasbacsai]

Thank you for the PR!