draft: Added dt support for xtc and trr trajectories.

[pbuslaev]

Fixes #4905

Changes made in this Pull Request:

• I added basic dt support for XTC and XDR Reader/Writer

PR Checklist

• Issue raised/referenced?
• Tests updated/added?
• Documentation updated/added?
• package/CHANGELOG file updated?
• Is your name in package/AUTHORS? (If it is not, add it!)

Developers Certificate of Origin

I certify that I can submit this code contribution as described in the Developer Certificate of Origin, under the MDAnalysis LICENSE.

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📚 Documentation preview 📚: https://mdanalysis--4908.org.readthedocs.build/en/4908/

[github-actions]

Hello there first time contributor! Welcome to the MDAnalysis community! We ask that all contributors abide by our Code of Conduct and that first time contributors introduce themselves on GitHub Discussions so we can get to know you. You can learn more about participating here. Please also add yourself to package/AUTHORS as part of this PR.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.64%. Comparing base (b79c77d) to head (41c0166).

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #4908      +/-   ##
===========================================
- Coverage    93.66%   93.64%   -0.02%     
===========================================
  Files          177      189      +12     
  Lines        21850    22933    +1083     
  Branches      3079     3086       +7     
===========================================
+ Hits         20466    21476    +1010     
- Misses         933     1006      +73     
  Partials       451      451              

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