fix: get seq number for non-multisig signing

[dudong2]

Description

Get sequence number for non-multisig signing in batch-sign

closes: #755

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 #754 (562ff8b) into main (eb1b5e2) will decrease coverage by 0.00%.
The diff coverage is 66.03%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #754      +/-   ##
==========================================
- Coverage   62.15%   62.15%   -0.01%     
==========================================
  Files         879      879              
  Lines       99385    99438      +53     
==========================================
+ Hits        61772    61804      +32     
- Misses      33996    34015      +19     
- Partials     3617     3619       +2     

Impacted Files	Coverage Δ
x/auth/client/cli/tx_sign.go	0.00% <0.00%> (ø)
x/auth/client/testutil/suite.go	96.81% <100.00%> (+0.08%)	⬆️
x/collection/msgs.go	50.00% <0.00%> (-1.64%)	⬇️
x/token/msgs.go	50.95% <0.00%> (-0.39%)	⬇️
x/wasm/keeper/keeper.go	86.16% <0.00%> (-0.37%)	⬇️
crypto/keys/internal/ecdsa/privkey.go	84.21% <0.00%> (+1.75%)	⬆️
x/token/validation.go	90.90% <0.00%> (+20.00%)	⬆️