feat!: add MultiSend deactivation

[tkxkd0159]

Description

closes: #868

Activate this feature on bankpluskeeper directly instead of using config. Because this feature is not supposed to change by an outside party. It need to use intentionally when build an App instance.

Motivation and context

How has this been tested?

Screenshots (if appropriate):

Checklist:

• I followed the contributing guidelines and code of conduct.
• I have added a relevant changelog to CHANGELOG.md
• I have added tests to cover my changes.
• I have updated the documentation accordingly.
• I have updated API documentation client/docs/swagger-ui/swagger.yaml

[codecov]

Codecov Report

Merging #876 (177af73) into main (611b286) will decrease coverage by 0.01%.
The diff coverage is 80.00%.

❗ Current head 177af73 differs from pull request most recent head 6f323e6. Consider uploading reports for the commit 6f323e6 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #876      +/-   ##
==========================================
- Coverage   62.37%   62.37%   -0.01%     
==========================================
  Files         653      653              
  Lines       79976    79985       +9     
==========================================
+ Hits        49885    49890       +5     
- Misses      27399    27402       +3     
- Partials     2692     2693       +1     

Impacted Files	Coverage Δ
x/bankplus/keeper/keeper.go	91.93% <78.57%> (-4.30%)	⬇️
simapp/app.go	82.30% <100.00%> (ø)
crypto/keys/internal/ecdsa/privkey.go	81.13% <0.00%> (-1.89%)	⬇️

[zemyblue]

@tkxkd0159 , unittest also should change.
https://github.com/line/lbm-sdk/blob/a7557b1d1029fcf9c112f3dc0cf94d158e197bc7/x/bankplus/keeper/keeper_test.go#L297-L299