The Well dataset class

[sgreenbury]

Contributes towards #447.

This PR adds:

• Well Dataset class for reshaping for 2D autoemulate
• Example notebook

Next steps:

• Enable the n_step_inputs to be set given the dataset passed
• Add tests

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Coverage report

This PR does not seem to contain any modification to coverable code.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 81.36%. Comparing base (8b50621) to head (71c0a46). Report is 199 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #488      +/-   ##
==========================================
+ Coverage   80.40%   81.36%   +0.96%     
==========================================
  Files         104      107       +3     
  Lines        7057     7512     +455     
==========================================
+ Hits         5674     6112     +438     
- Misses       1383     1400      +17     

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[radka-j]

Closing as no longer planned to pursue this direction.