Create default fallback

[jacobtomlinson]

Added a default lookup location for create_cluster(). If you fail to specify the path to a valid spec it will try and find it at dask-cluster.yaml.

>>> import dask_ctl.lifecycle
>>> dask_ctl.lifecycle.create_cluster()
DaskClusterConfigNotFound: Unable to find dask-cluster.yaml

You can also set the local_fallback=True option to start a LocalCluster if a spec file is not found.

>>> import dask_ctl.lifecycle
>>> dask_ctl.lifecycle.create_cluster(local_fallback=True)
LocalCluster(3ce576d4, 'tcp://127.0.0.1:8787', workers=4, threads=12, memory=93.02 GiB)

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (afc0e5c) 71.14% compared to head (d00ace7) 72.01%.

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Additional details and impacted files

@@            Coverage Diff             @@
##             main      #65      +/-   ##
==========================================
+ Coverage   71.14%   72.01%   +0.86%     
==========================================
  Files          10       11       +1     
  Lines         357      368      +11     
==========================================
+ Hits          254      265      +11     
  Misses        103      103              

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