Ep13 Dataset API - Phase 1

[SpacemanPaul]

Reason for this pull request

First batch of dataset resource API changes from EP13 - Index Driver API cleanup

Proposed changes

• Add new get_unsafe() method for consistency with other resources. Implement get with get_unsafe

• Add new arguments to get and get_unsafe for EP8 lineage handling - implement in postgis driver

• Deprecate get_derived() method

• Implement get_product_time_bounds() with new temporal_extent method. Not fully implemented in postgres driver for "boring technical reasons", as per EP13.

• Tests added / passed

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

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (bb42559) 85.30% compared to head (f41718f) 85.41%.

Additional details and impacted files

@@               Coverage Diff               @@
##           develop-1.9    #1538      +/-   ##
===============================================
+ Coverage        85.30%   85.41%   +0.11%     
===============================================
  Files              140      140              
  Lines            14994    15040      +46     
===============================================
+ Hits             12790    12846      +56     
+ Misses            2204     2194      -10     

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