feat: improve close factor

[toteki]

Description

closes: #1166

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[codecov-commenter]

Codecov Report

Merging #1322 (bcaff3f) into main (e9782df) will increase coverage by 0.12%.
The diff coverage is 81.81%.

@@            Coverage Diff             @@
##             main    #1322      +/-   ##
==========================================
+ Coverage   52.09%   52.22%   +0.12%     
==========================================
  Files          69       69              
  Lines        6816     6824       +8     
==========================================
+ Hits         3551     3564      +13     
+ Misses       2988     2984       -4     
+ Partials      277      276       -1     

Impacted Files	Coverage Δ
x/leverage/keeper/liquidate.go	83.03% <75.00%> (+4.04%)	⬆️
x/leverage/keeper/collateral.go	69.17% <100.00%> (ø)
x/leverage/types/token.go	72.52% <100.00%> (ø)

[robert-zaremba]

Good update. I've added few suggestions with docs improvements.
Also, I really think we must not allow that a token.settings.liquidation_threshold >= 1

[toteki]

Should be good to review again now

[robert-zaremba]

utACK