add wasm extra proposal

[zjg555543]

• Targeted PR against correct branch (see CONTRIBUTING.md)

• [ ] Linked to github-issue with discussion and accepted design OR link to spec that describes this work.

• [ ] Wrote tests

• [ ] Updated relevant documentation (docs/)

• [ ] Added a relevant changelog entry to the Unreleased section in CHANGELOG.md

• [ ] Reviewed Files changed in the github PR explorer

---

For Admin Use:

• Added appropriate labels to PR (ex. wip, ready-for-review, docs)
• Reviewers Assigned
• Squashed all commits, uses message "Merge PR #XYZ: [title]" (coding standards)

[codecov-commenter]

Codecov Report

Merging #3091 (5fa2787) into dev (3210d53) will decrease coverage by 0.13%. The diff coverage is 5.14%.

:exclamation: Current head 5fa2787 differs from pull request most recent head 919400f. Consider uploading reports for the commit 919400f to get more accurate results

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@@            Coverage Diff             @@
##              dev    #3091      +/-   ##
==========================================
- Coverage   35.86%   35.74%   -0.13%     
==========================================
  Files         434      434              
  Lines       45560    45729     +169     
==========================================
+ Hits        16339    16344       +5     
- Misses      28035    28199     +164     
  Partials     1186     1186              

Impacted Files	Coverage Δ
x/gov/types/content.go	0.00% <ø> (ø)
x/wasm/client/cli/gov_custom.go	0.00% <0.00%> (ø)
x/wasm/client/cli/gov_tx.go	0.00% <ø> (ø)
x/wasm/client/utils/utils.go	50.00% <0.00%> (-21.43%)	:arrow_down:
x/wasm/keeper/contract_keeper.go	55.55% <0.00%> (-3.27%)	:arrow_down:
x/wasm/keeper/keeper.go	75.67% <0.00%> (-3.38%)	:arrow_down:
x/wasm/keeper/proposal_handler.go	0.00% <0.00%> (ø)
x/wasm/module.go	16.12% <0.00%> (-0.27%)	:arrow_down:
x/wasm/types/errors.go	0.00% <0.00%> (ø)
x/wasm/types/keys.go	44.23% <ø> (ø)
... and 6 more

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