Migrate to SQLAlchemy 2.0

[SpacemanPaul]

Reason for this pull request

SQLAlchemy2.0 has been released with a number of backwards incompatible API changes. Datacube-1.9 is a convenient place to deal with this.

Proposed changes

• Use the new postgresql dialect Range type hierarchy.

• Fix all remaining SQLA1.4 query and row access API incompatibilities.

• Update ensure_db implementations to work with SQLA2.0 transaction defaults.

• Closes Migrate to SQLAlchemy 2.0 #1431

• Tests added / passed

• Fully documented, including docs/about/whats_new.rst for all changes

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.04 🎉

Comparison is base (91a513a) 91.91% compared to head (aa7b7c9) 91.95%.

Additional details and impacted files

@@               Coverage Diff               @@
##           develop-1.9    #1432      +/-   ##
===============================================
+ Coverage        91.91%   91.95%   +0.04%     
===============================================
  Files              135      135              
  Lines            15088    15085       -3     
===============================================
+ Hits             13868    13872       +4     
+ Misses            1220     1213       -7     

Impacted Files	Coverage Δ
datacube/drivers/postgis/_api.py	87.26% <100.00%> (ø)
datacube/drivers/postgis/_core.py	98.96% <100.00%> (+4.01%)	⬆️
datacube/drivers/postgis/sql.py	83.92% <100.00%> (+0.29%)	⬆️
datacube/drivers/postgres/_api.py	96.27% <100.00%> (+0.01%)	⬆️
datacube/drivers/postgres/_core.py	99.02% <100.00%> (+2.76%)	⬆️
datacube/drivers/postgres/_fields.py	90.53% <100.00%> (ø)
datacube/drivers/postgres/sql.py	98.21% <100.00%> (+0.03%)	⬆️
datacube/index/postgis/_datasets.py	74.81% <100.00%> (ø)
datacube/index/postgres/_datasets.py	94.84% <100.00%> (ø)

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[omad]

I think this looks good, bar the 1 line change in the GitHub actions workflow.

And even that, the whole workflow file either needs a bunch of comments to explain what's going on, or refactoring to make it less insane...

[SpacemanPaul]

I think this looks good, bar the 1 line change in the GitHub actions workflow.

And even that, the whole workflow file either needs a bunch of comments to explain what's going on, or refactoring to make it less insane...

GHA workflows have long been black magic to me - I learned a lot on this PR.