Remove DualCase dispatchers

[ericnordelo]

Fixes #1128

PR Checklist

• Tests
• Documentation
• Added entry to CHANGELOG.md
• Tried the feature on a public network

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.51%. Comparing base (32a8d2b) to head (d017517).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1163      +/-   ##
==========================================
+ Coverage   88.87%   91.51%   +2.63%     
==========================================
  Files          57       46      -11     
  Lines        1375     1178     -197     
==========================================
- Hits         1222     1078     -144     
+ Misses        153      100      -53     

Files with missing lines	Coverage Δ
...ges/account/src/extensions/src9/snip12_utils.cairo	47.05% <ø> (ø)
packages/account/src/extensions/src9/src9.cairo	91.66% <100.00%> (ø)
packages/token/src/erc1155/erc1155.cairo	98.96% <100.00%> (ø)
...kages/token/src/erc20/extensions/erc20_votes.cairo	94.11% <100.00%> (ø)
packages/token/src/erc721/erc721.cairo	90.24% <100.00%> (-0.82%)	⬇️

... and 4 files with indirect coverage changes

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[andrew-fleming]

LGTM!