fix: oracle price calculation

[apopiak]

When ingesting data via on_liquidity_changed the oracle should calculate the price based on the liquidity, not the amounts.

based on #186 and #182

[codecov]

Codecov Report

Patch coverage: 96.29% and no project coverage change.

Comparison is base (12e4be6) 73.38% compared to head (7794c7f) 73.38%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #187   +/-   ##
=======================================
  Coverage   73.38%   73.38%           
=======================================
  Files          41       41           
  Lines        3438     3442    +4     
=======================================
+ Hits         2523     2526    +3     
- Misses        915      916    +1     

Impacted Files	Coverage Δ
ema-oracle/src/lib.rs	86.57% <90.90%> (-0.59%)	⬇️
ema-oracle/src/benchmarking.rs	98.75% <100.00%> (+0.01%)	⬆️
ema-oracle/src/types.rs	81.94% <100.00%> (+0.25%)	⬆️

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