Add sorting of ApiRoute, guaranteeing stable file output.

[yanks]

For generations using the JSON-allowlist, the current version does not guarantee that source will be written in the same order. I have addressed this by making sure routes are added in a stable order.

General Contributing

• Have you read the Code of Conduct and signed the CLA?

Is This a Code Change?

• Non-code related change (markdown/git settings etc)
• Code Change
• Example/Test Code Change

Validation

• Have you ran tox?
• Do the tests pass?

[codecov]

Codecov Report

Merging #260 (00c7d6a) into main (2996b3c) will increase coverage by 0.03%.
The diff coverage is 65.21%.

@@            Coverage Diff             @@
##             main     #260      +/-   ##
==========================================
+ Coverage   51.60%   51.64%   +0.03%     
==========================================
  Files          37       37              
  Lines        8400     8423      +23     
  Branches     1790     1794       +4     
==========================================
+ Hits         4335     4350      +15     
- Misses       3751     3757       +6     
- Partials      314      316       +2     

Flag	Coverage Δ
unit	51.64% <65.21%> (+0.03%)	⬆️

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Impacted Files	Coverage Δ
stone/ir/api.py	81.94% <63.63%> (-2.08%)	⬇️
stone/frontend/ir_generator.py	80.59% <100.00%> (+0.02%)	⬆️

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[rogebrd]

lgtm!