Fix: Remove climetlab to be replaced by earthkit

[HCookie]

• Replaces climetlab with earthkit
• Added to CHANGELOG
• Adjusted pyproject.toml

Closes #7

[FussyDuck]

All committers have signed the CLA.

[gmertes]

Nice!

Am I right that this is not backwards compatible with a climetlab input, because of the changes to datetime?

(it doesn't need to be compatible, just for my own understanding)

[HCookie]

@gmertes At the moment, yes it is not backwards compatible. It might be possible to make it so

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.50%. Comparing base (48f21cd) to head (60e634f).
Report is 3 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop       #8   +/-   ##
========================================
  Coverage    85.50%   85.50%           
========================================
  Files            2        2           
  Lines           69       69           
========================================
  Hits            59       59           
  Misses          10       10           

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