CT-428 Fix ETH Hop tx gas Estimation

[marktoda]

The amount being sent can actually have a big impact on the gas used -- we need to pass this through to get a more accurate estimate

See https://github.com/BitGo/platform/pull/805 for the collary platform diff

[codecov]

Codecov Report

Merging #397 into master will increase coverage by 22.13%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           master     #397       +/-   ##
===========================================
+ Coverage   38.39%   60.52%   +22.13%     
===========================================
  Files          71       72        +1     
  Lines        9682     9689        +7     
  Branches     2121     2122        +1     
===========================================
+ Hits         3717     5864     +2147     
+ Misses       5328     2897     -2431     
- Partials      637      928      +291

Flag	Coverage Δ
#integration	38.39% <ø> (ø)	⬆️
#unit	54.35% <ø> (?)

Impacted Files	Coverage Δ
src/v2/trading/trade.ts	100% <0%> (ø)
src/v2/coins/bsv.ts	35.06% <0%> (+1.29%)	⬆️
src/keychains.ts	34% <0%> (+1.33%)	⬆️
src/v2/coinFactory.ts	94.62% <0%> (+2.15%)	⬆️
src/v2/coins/token.ts	71.52% <0%> (+2.64%)	⬆️
src/util.ts	64.78% <0%> (+2.81%)	⬆️
src/v2/coins/tbch.ts	78.57% <0%> (+3.57%)	⬆️
src/v2/coins/txlm.ts	78.57% <0%> (+3.57%)	⬆️
src/index.ts	96% <0%> (+4%)	⬆️
src/v2/coins/txrp.ts	76% <0%> (+4%)	⬆️
... and 42 more

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[twtaylorbitgo]

LGTM