feat: x/metoken balances and prices query improvements

[kosegor]

• Amplifying both queries with some additional information was requested from the FE: https://linear.app/umee/issue/UMEE-808/metoken-query-changes-for-frontend

[codecov]

Codecov Report

Merging #2198 (4b7f8b6) into main (7f05ad4) will decrease coverage by 5.27%.
Report is 184 commits behind head on main.
The diff coverage is 79.35%.

@@            Coverage Diff             @@
##             main    #2198      +/-   ##
==========================================
- Coverage   75.38%   70.12%   -5.27%     
==========================================
  Files         100      166      +66     
  Lines        8025    12615    +4590     
==========================================
+ Hits         6050     8846    +2796     
- Misses       1589     3177    +1588     
- Partials      386      592     +206     

Files Changed	Coverage Δ
ante/spam_prevention.go	75.92% <ø> (ø)
cmd/ibc_denom/main.go	0.00% <0.00%> (ø)
util/coin/coin.go	12.50% <0.00%> (ø)
x/incentive/codec.go	47.82% <ø> (+9.89%)	⬆️
x/incentive/keeper/invariants.go	0.00% <0.00%> (ø)
x/incentive/keeper/reward.go	82.35% <ø> (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)
... and 59 more

... and 68 files with indirect coverage changes

[gsk967]

LGTM, Pre Approving
Small nit can you look into those comments

[robert-zaremba]

let's change the PriceByBaseDenom api