Add output structure style single-package

[tefra]

Resolves #469

• Add a structure style to group all classes into a single package
• Add new cli argument --structure-style
• Depreacte --ns-struct

[codecov]

Codecov Report

Merging #470 (8f0fd79) into master (338c401) will not change coverage.
The diff coverage is 100.00%.

❗ Current head 8f0fd79 differs from pull request most recent head 3a174b1. Consider uploading reports for the commit 3a174b1 to get more accurate results

@@            Coverage Diff            @@
##            master      #470   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           77        81    +4     
  Lines         7169      7258   +89     
  Branches      1283      1303   +20     
=========================================
+ Hits          7169      7258   +89     

Impacted Files	Coverage Δ
xsdata/codegen/analyzer.py	100.00% <ø> (ø)
xsdata/cli.py	100.00% <100.00%> (ø)
xsdata/codegen/container.py	100.00% <100.00%> (ø)
xsdata/codegen/handlers/__init__.py	100.00% <100.00%> (ø)
xsdata/codegen/handlers/attribute_default_value.py	100.00% <100.00%> (ø)
xsdata/codegen/handlers/attribute_name_conflict.py	100.00% <100.00%> (ø)
xsdata/codegen/handlers/attribute_restrictions.py	100.00% <100.00%> (ø)
xsdata/codegen/handlers/attribute_sanitizer.py	100.00% <100.00%> (ø)
xsdata/codegen/handlers/choice_group.py	100.00% <100.00%> (ø)
xsdata/codegen/handlers/class_name_conflict.py	100.00% <100.00%> (ø)
... and 14 more

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[sonarqubecloud]

Kudos, SonarCloud Quality Gate passed!

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
0.0% Duplication