add partial unlocking flag for cli

[mconcat]

Closes: #998

Description

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For contributor use:

• Targeted PR against correct branch (see CONTRIBUTING.md)
• Updated relevant documentation (docs/) or specification (x/<module>/spec/)
• Added a relevant changelog entry to the Unreleased section in CHANGELOG.md
• Re-reviewed Files changed in the Github PR explorer

[codecov-commenter]

Codecov Report

Merging #1049 (151990d) into main (bff6f64) will increase coverage by 0.01%.
The diff coverage is 53.84%.

@@            Coverage Diff             @@
##             main    #1049      +/-   ##
==========================================
+ Coverage   20.60%   20.61%   +0.01%     
==========================================
  Files         193      193              
  Lines       25237    25249      +12     
==========================================
+ Hits         5199     5205       +6     
- Misses      19084    19088       +4     
- Partials      954      956       +2     

Impacted Files	Coverage Δ
x/lockup/client/cli/tx.go	59.75% <40.00%> (-3.26%)	⬇️
x/lockup/client/cli/flags.go	66.66% <100.00%> (+16.66%)	⬆️

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[ValarDragon]

utACK