refactore(leverage): rename ExchangeToken

[robert-zaremba]

Description

ref: #2167 (comment)

• fixed go mocks in metoken (they were outdated)
• fixed intest in quota (it was using wrong constructor)

[toteki]

Let's think of a better name

[toteki]

Maybe ToToken() and ToUToken()?

[robert-zaremba]

Maybe ToToken() and ToUToken()?

OK

[toteki]

a little cleanup

[codecov]

Codecov Report

Merging #2180 (c50332b) into main (7f05ad4) will decrease coverage by 6.44%.
Report is 165 commits behind head on main.
The diff coverage is 82.35%.

@@            Coverage Diff             @@
##             main    #2180      +/-   ##
==========================================
- Coverage   75.38%   68.95%   -6.44%     
==========================================
  Files         100      152      +52     
  Lines        8025    11674    +3649     
==========================================
+ Hits         6050     8050    +2000     
- Misses       1589     3082    +1493     
- Partials      386      542     +156     

Files Changed	Coverage Δ
ante/spam_prevention.go	75.92% <ø> (ø)
x/incentive/codec.go	47.82% <ø> (+9.89%)	⬆️
x/incentive/keeper/invariants.go	0.00% <0.00%> (ø)
x/incentive/keeper/store.go	70.67% <ø> (ø)
x/incentive/keeper/unbonding.go	80.45% <ø> (ø)
x/incentive/keeper/update.go	52.11% <ø> (ø)
x/incentive/keys.go	100.00% <ø> (ø)
x/incentive/msgs.go	77.41% <ø> (-0.81%)	⬇️
x/incentive/params.go	89.28% <ø> (-10.72%)	⬇️
x/leverage/client/tests/suite.go	100.00% <ø> (ø)
... and 54 more

... and 59 files with indirect coverage changes

[kosegor]

approving x/metoken module part