Improve issue and PR templates

[rdeago]

Types of changes

• Bugfix
• Enhancement (new and/or improved behavior)
• Refactoring (no functional changes)
• Code style update (no functional changes)
• Dependencies added, updated, or removed
• Build related changes
• Repository infrastructure changes (e.g. changes to issue / PR templates)
• CI related changes
• Documentation update
• Other (please describe below)

Proposed changes / fixed issues

• Add current project version at the top of bug report and enhancement proposal templates
• Add repository infrastructure changes to "Types of changes" checklist in PR template

Checklist

• My contribution is either my original work, or comes from projects with an MIT-compatible license, in which case I have updated the THIRD-PARTY-NOTICES file accordingly
• I have added and/or updated related documentation (if applicable)
• I have updated the "Unreleased changes" section in CHANGELOG.md according to the modifications I made

Other information

[codecov-io]

Codecov Report

Merging #15 into main will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main      #15   +/-   ##
=======================================
  Coverage   66.66%   66.66%           
=======================================
  Files           3        3           
  Lines         105      105           
  Branches       21       21           
=======================================
  Hits           70       70           
  Misses         25       25           
  Partials       10       10           

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[rdeago]

This PR is also an excuse to test updated actions.

actions/labeler@main is used instead of actions/[email protected]: the change was made for better debugging, but main just works, so who am I to judge. Let's hope they release a new tagged version soon.