feat: sort attributes to produce consistent values

[toopay]

Description

Currently, raiden imports can produce code diffs caused by the ordering of model relations or imported libraries. Sorting them will prevent this.

Type of change

• [ ] Bug fix (non-breaking change which fixes an issue)
• [x] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [ ] Unit Tests

Checklist

• [x] My code follows the style guidelines of this project
• [x] I have performed a self-review of my own code
• [x] I have commented my code, particularly in hard-to-understand areas
• [x] I have made corresponding changes to the documentation
• [x] My changes generate no new warnings
• [ ] I have added tests that prove my fix is effective or that my feature works
• [x] New and existing unit tests pass locally with my changes
• [x] Any dependent changes have been merged and published in downstream modules

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Flag	Coverage Δ
-race	71.94% <100.00%> (-0.01%)	:arrow_down:
-tags "sonic avx"	71.91% <100.00%> (-0.02%)	:arrow_down:
-tags go_json	71.94% <100.00%> (-0.05%)	:arrow_down:
-tags nomsgpack	72.01% <100.00%> (+0.05%)	:arrow_up:
go-1.21	71.23% <100.00%> (-0.02%)	:arrow_down:
go-1.22	71.99% <100.00%> (+<0.01%)	:arrow_up:
macos-latest	72.01% <100.00%> (+0.04%)	:arrow_up:
ubuntu-latest	71.96% <100.00%> (-0.01%)	:arrow_down:

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
pkg/generator/model.go	79.26% <100.00%> (+0.38%)	:arrow_up:
pkg/generator/rpc.go	76.13% <100.00%> (+0.06%)	:arrow_up:

... and 1 file with indirect coverage changes