Fix: calculating optimal route on fuse swap

[L03TJ3]

Description

We were checking to many pairs which made calculating receive-amount take longer then a minute. Aligned with this PR: https://github.com/GoodDollar/GoodWeb3-Mono/pull/134

this pr:

• [x] adds caching for the voltage-pair-data

About # (link your issue here)

537

430

[L03TJ3]

Closing, not needed