Add `--caching` option (off by default)

[jwodder]

Closes #103.

[codecov[bot]]

Codecov Report

Attention: 5 lines in your changes are missing coverage. Please review.

Comparison is base (fca996a) 90.93% compared to head (ced4a78) 90.72%.

Files	Patch %	Lines
datalad_fuse/fsspec.py	70.00%	3 Missing :warning:
datalad_fuse/fsspec_cache_clear.py	33.33%	2 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #104 +/- ## ========================================== - Coverage 90.93% 90.72% -0.22% ========================================== Files 10 10 Lines 596 604 +8 ========================================== + Hits 542 548 +6 - Misses 54 56 +2 ```

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[yarikoptic]

Great, thank you! could you please

• look into why benchmarking installation fails?
• also add parametrize to e.g. test_fuse on caching so we generally test both implementations?

[jwodder]

@yarikoptic Done.