Use new chunks header format

[katamartin]

• Corresponds to Use a more complex chunks header pangeo-data/zarr-proxy#7
• For example, we send the following header for the s3://mur-sst/zarr:

chunks: time=6443, analysed_sst=30,100,100, analysis_error=30,100,100, mask=30,100,100, sea_ice_fraction=30,100,100

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[andersy005]

chunks: time=6443, analysed_sst=30,100,100, analysis_error=30,100,100, mask=30,100,100, sea_ice_fraction=30,100,100

can confirm headers parsing works in zarr-proxy

In [1]: from zarr_proxy.logic import parse_chunks_header

In [2]: chunks='time=6443, analysed_sst=30,100,100, analysis_error=30,100,100, mask=30,100,100, sea_ice_fraction=30,100,100'

In [3]: parse_chunks_header(chunks)
Out[3]: 
{'time': (6443,),
 'sst': (30, 100, 100),
 'error': (30, 100, 100),
 'mask': (30, 100, 100),
 'fraction': (30, 100, 100)}

[andersy005]

👍🏽 Looks good