Add download subcommand for schemas and definitions

[tefra]

Resolves #278

[codecov]

Codecov Report

Merging #279 into master will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master      #279   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           67        68    +1     
  Lines         5159      5238   +79     
  Branches       884       896   +12     
=========================================
+ Hits          5159      5238   +79     

Impacted Files	Coverage Δ
xsdata/cli.py	100.00% <100.00%> (ø)
xsdata/models/wsdl.py	100.00% <100.00%> (ø)
xsdata/utils/downloader.py	100.00% <100.00%> (ø)

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[sonarqubecloud]

Kudos, SonarCloud Quality Gate passed!

0 Bugs
0 Vulnerabilities (and 0 Security Hotspots to review)
0 Code Smells

No Coverage information
0.0% Duplication