Support copying and cloning to temporary directories

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 85.24590% with 9 lines in your changes missing coverage. Please review.

Project coverage is 88.37%. Comparing base (c7f9fa1) to head (9fe6545). Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
foamlib/_cases/_async.py	73.33%	8 Missing :warning:
foamlib/_cases/_sync.py	94.44%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #186 +/- ## ========================================== - Coverage 88.66% 88.37% -0.29% ========================================== Files 14 15 +1 Lines 979 1032 +53 ========================================== + Hits 868 912 +44 - Misses 111 120 +9 ```

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