Rename DataSources enum to DataSource

[akash5100]

• closes Rename enum "Datasources" to "Datasource" #66

[nabobalis]

I think we need to rename the file to drop the s as well.

Any place that has datasources should be singular now.

[nabobalis]

I think the API page will need changing?

[codecov-commenter]

Codecov Report

Merging #69 (6938daa) into main (c8d31f5) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main      #69   +/-   ##
=======================================
  Coverage   99.49%   99.49%           
=======================================
  Files          23       23           
  Lines         599      599           
=======================================
  Hits          596      596           
  Misses          3        3           

Impacted Files	Coverage Δ
hvpy/datasource.py	100.00% <100.00%> (ø)
hvpy/utils.py	100.00% <100.00%> (ø)

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[akash5100]

Okay