Postgres ranges rebuild

[SpacemanPaul]

Complete rewrite of the OWS schema management:

1. All tables and views moved to the new "ows" schema.
2. Cleanup tool for removing the old "wms" schema (and the old MV's which lived in the public schema)
3. Product and multiproduct range tables combined into a single "layer ranges" table. Unused historic sub-product table removed.
4. Stronger permissions management. Can now separately grant read-only (service running user) permissions and read-write permissions (datacube-ows-update runnning users).
5. Note that manipulating the schema now generally requires dbo/superuser permissions.
6. Range table updating and reading code completely rewritten and greatly simplified.
7. Misc other cleanup (including renaming confusing "product" references to "layer".

Still in draft to get the integration tests running on github again and check test coverage - some documentation updates also required.

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📚 Documentation preview 📚: https://datacube-ows--1017.org.readthedocs.build/en/1017/

[codecov]

Codecov Report

Attention: Patch coverage is 89.08451% with 31 lines in your changes missing coverage. Please review.

Project coverage is 93.59%. Comparing base (722bc6e) to head (0de93b4).
Report is 34 commits behind head on develop-1.9.

Files with missing lines	Patch %	Lines
datacube_ows/update_ranges_impl.py	80.64%	18 Missing ⚠️
datacube_ows/ows_configuration.py	84.90%	8 Missing ⚠️
datacube_ows/product_ranges.py	95.40%	4 Missing ⚠️
datacube_ows/wms_utils.py	95.00%	1 Missing ⚠️

Additional details and impacted files

@@               Coverage Diff               @@
##           develop-1.9    #1017      +/-   ##
===============================================
- Coverage        93.77%   93.59%   -0.19%     
===============================================
  Files               46       46              
  Lines             6573     6616      +43     
===============================================
+ Hits              6164     6192      +28     
- Misses             409      424      +15     

Files with missing lines	Coverage Δ
datacube_ows/cfg_parser_impl.py	98.68% <100.00%> (ø)
datacube_ows/loading.py	80.81% <100.00%> (ø)
datacube_ows/mv_index.py	94.05% <ø> (ø)
datacube_ows/ogc.py	86.02% <100.00%> (+1.06%)	⬆️
datacube_ows/styles/base.py	95.91% <100.00%> (ø)
datacube_ows/wcs1.py	100.00% <100.00%> (ø)
datacube_ows/wcs1_utils.py	95.25% <100.00%> (ø)
datacube_ows/wcs2.py	92.30% <100.00%> (ø)
datacube_ows/wcs2_utils.py	91.95% <100.00%> (ø)
datacube_ows/wms_utils.py	92.05% <95.00%> (-0.03%)	⬇️
... and 3 more

[SpacemanPaul]

Thanks Peter. That was a really helpful review.

[Ariana-B]

lgtm

[pjonsson]

We're in opposite time zones so me blocking progress is probably worse than any errors slipping in, go ahead and merge according to your own judgement.

I don't know anything about the code base, but besides the assignment to TYPE_CHECKING, the changes look reasonable to me.