ApiRoute: Provide a hash implementation, too.

[yanks]

This adds a hash implementation to ApiRoute as well, as it is required by some downstream code.

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 #261 (616dc74) into main (32b0c0f) will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #261      +/-   ##
==========================================
+ Coverage   51.64%   51.65%   +0.01%     
==========================================
  Files          37       37              
  Lines        8423     8425       +2     
  Branches     1794     1794              
==========================================
+ Hits         4350     4352       +2     
  Misses       3757     3757              
  Partials      316      316              

Flag	Coverage Δ
unit	51.65% <100.00%> (+0.01%)	⬆️

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Impacted Files	Coverage Δ
stone/ir/api.py	82.11% <100.00%> (+0.16%)	⬆️

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[aelawson]

Approving w/ offline review from jrm