Refactor model handling, support modelling with "all" models

[robbibt]

Changes

• Add new "all" option to model param, which will model tides using all available tide models in your provided directory
• Move model list handling to a separate utils function _standardise_models, which handles providing models as strings or lists, as well as handling custom "all" and "ensemble" options

Bug fixes

• Fix bug where GOT5.6 was not detected as a valid model because it contains files in multiple directories (both "GOT5.6" and "GOT5.5"

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 66.66667% with 9 lines in your changes missing coverage. Please review.

Project coverage is 81.3%. Comparing base (56beb4c) to head (b0ec3f8).

Files with missing lines	Patch %	Lines
eo_tides/utils.py	62.5%	6 Missing and 3 partials ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##            main     #26     +/-   ##
=======================================
- Coverage   81.5%   81.3%   -0.2%     
=======================================
  Files          6       6             
  Lines        622     632     +10     
  Branches     107     110      +3     
=======================================
+ Hits         507     514      +7     
- Misses        69      71      +2     
- Partials      46      47      +1     

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