Multiple Choice Veto

[NoahSaso]

This PR applies the same changes as #752 to the dao-proposal-multiple contract, adding support for the veto feature from #736.

[codecov]

Codecov Report

Attention: 3 lines in your changes are missing coverage. Please review.

Comparison is base (6b228ce) 96.37% compared to head (2d333ae) 96.45%.

❗ Current head 2d333ae differs from pull request most recent head 986e8e0. Consider uploading reports for the commit 986e8e0 to get more accurate results

Files	Patch %	Lines
...cts/proposal/dao-proposal-multiple/src/contract.rs	97.77%	2 Missing ⚠️
...l/dao-proposal-multiple/src/testing/instantiate.rs	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             veto     #777      +/-   ##
==========================================
+ Coverage   96.37%   96.45%   +0.07%     
==========================================
  Files         204      204              
  Lines       51133    52354    +1221     
==========================================
+ Hits        49281    50499    +1218     
- Misses       1852     1855       +3     

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