Ability to read metadata without reading whole data set & temporal subsets

[lewisblake]

Notes from pyaerocom 28.10.24:

Two requests from pyaro:

1. We want a cheap way to access the data_revision without reading the data.
2. We want a way to read temporal subsets of the data.

Originally posted by @lewisblake in metno/pyaerocom#1302 (comment)

[heikoklein]

Temporal subsets can be read using the TimeBoundsFilter (I just recognize that the API on readthedocs doesn't work #51 ). Some readers, e.g. the netcdf-rw filter implement that directly, i.e. before reading the data, while other readers just filter after reading. Maybe this solves already issue 2?

Issue 1 is absolutely valid, now that all datasets should have a revision #37 .

[lewisblake]

Awesome, thanks for the update!