Experimental pyarrow backed interface for accessing (smry) time series data

[sigurdp]

Experimental implementation of disk-based caching of (smry) time series data using pyarrow.
Also contains a more naive parquet based implementation.

I have been testing with pyarrow 3.0.0 so you may have to manually run pip install pyarrow==3.0.0

ensemble_time_series_perf_testing.py contains code for doing some simple performance testing.
Note that the perf testing code must be adapted to local disk system.
Should be runnable with: python -m webviz_subsurface._models.ensemble_time_series_perf_testing

[anders-kiaer]

Superseded by #721?

[sigurdp]

Superseded by #721?

Absolutely :-)