New driver based loader

[Kirill888]

Use odc.loader routines for loading data when driver= is supplied in the dc.load command.

This will become standard way of loading eventually.

At this moment odc.loader code is shipped by odc-stac package starting from odc-stac>=0.3.10

To try this out

1. Install odc-stac==0.3.10

2. Use your normal dc.load but add driver="rio" to route to odc.loader logic, same as used by odc.stac.load

   • [ ] Closes #xxxx
   • [ ] Tests added / passed
   • [ ] Fully documented, including docs/about/whats_new.rst for all changes

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 14.51613% with 53 lines in your changes missing coverage. Please review.

Project coverage is 85.15%. Comparing base (02eb561) to head (1466de2).

:exclamation: Current head 1466de2 differs from pull request most recent head c75042c

Please upload reports for the commit c75042c to get more accurate results.

Files	Patch %	Lines
datacube/storage/_loader.py	13.55%	51 Missing :warning:
datacube/api/core.py	33.33%	2 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## develop-1.9 #1609 +/- ## =============================================== - Coverage 85.44% 85.15% -0.29% =============================================== Files 140 141 +1 Lines 15502 15564 +62 =============================================== + Hits 13245 13254 +9 - Misses 2257 2310 +53 ```

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