feat(x/ecocredit): add remove allowed denom gov message

[aleem1314]

Description

Ref: #729

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Author Checklist

All items are required. Please add a note to the item if the item is not applicable and
please add links to any relevant follow up issues.

I have...

• included the correct type prefix in the PR title
• added ! to the type prefix if API or client breaking change
• targeted the correct branch (see PR Targeting)
• provided a link to the relevant issue or specification
• followed the guidelines for building modules
• included the necessary unit and integration tests
• added a changelog entry to CHANGELOG.md
• included comments for documenting Go code
• updated the relevant documentation or specification
• reviewed "Files changed" and left comments if necessary
• confirmed all CI checks have passed

Reviewers Checklist

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your handle next to the items reviewed if you only reviewed selected items.

I have...

• confirmed the correct type prefix in the PR title
• confirmed ! in the type prefix if API or client breaking change
• confirmed all author checklist items have been addressed
• reviewed state machine logic
• reviewed API design and naming
• reviewed documentation is accurate
• reviewed tests and test coverage
• manually tested (if applicable)

[codecov]

Codecov Report

Merging #1346 (7b4c9ea) into master (9aef28b) will decrease coverage by 0.24%.
The diff coverage is 69.56%.

❗ Current head 7b4c9ea differs from pull request most recent head be7d074. Consider uploading reports for the commit be7d074 to get more accurate results

@@            Coverage Diff             @@
##           master    #1346      +/-   ##
==========================================
- Coverage   77.36%   77.11%   -0.25%     
==========================================
  Files         211      215       +4     
  Lines       15395    15465      +70     
==========================================
+ Hits        11910    11926      +16     
- Misses       2582     2629      +47     
- Partials      903      910       +7     

Impacted Files	Coverage Δ
.../ecocredit/marketplace/msg_remove_allowed_denom.go	50.00% <50.00%> (ø)
...dit/server/marketplace/msg_remove_allowed_denom.go	77.77% <77.77%> (ø)
x/ecocredit/marketplace/codec.go	100.00% <100.00%> (ø)
x/ecocredit/server/marketplace/keeper.go	100.00% <100.00%> (ø)
x/ecocredit/server/server.go	73.91% <100.00%> (ø)
app/app.go	73.14% <0.00%> (-0.42%)	⬇️
...credit/server/marketplace/msg_add_allowed_denom.go
x/ecocredit/marketplace/msg_add_allowed_denom.go
... and 5 more

[ryanchristo]

tACK

[technicallyty]

LGTM, 1 nit