chore!: rename k to square_size

[rootulp]

Closes #687

[codecov-commenter]

Codecov Report

Merging #774 (c701cd3) into main (53d688e) will not change coverage.
The diff coverage is 72.22%.

@@           Coverage Diff           @@
##             main     #774   +/-   ##
=======================================
  Coverage   23.24%   23.24%           
=======================================
  Files          71       71           
  Lines        8796     8796           
=======================================
  Hits         2045     2045           
  Misses       6578     6578           
  Partials      173      173           

Impacted Files	Coverage Δ
x/payment/types/tx.pb.go	18.04% <44.44%> (ø)
x/payment/types/verify_sigs.go	36.84% <100.00%> (ø)
x/payment/types/wirepayfordata.go	66.35% <100.00%> (ø)

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