fix(bridge-ui): handle scientific notation

[jscriptcoder]

Problem: Relayer might return e-notation ints such as 2e+21. BigNumber cannot handle this format

Solution: using built-in BigInt to help us handle it

Note: Bridge-UI v2 is no longer using BigNumber library. will be using built-in bigint instead 😉

[codecov]

Codecov Report

Merging #14105 (0ab69ca) into main (eda0333) will increase coverage by 0.04%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main   #14105      +/-   ##
==========================================
+ Coverage   51.57%   51.62%   +0.04%     
==========================================
  Files         148      149       +1     
  Lines        3874     3878       +4     
  Branches      336      336              
==========================================
+ Hits         1998     2002       +4     
  Misses       1765     1765              
  Partials      111      111              

Flag	Coverage Δ		*Carryforward flag
bridge-ui	94.26% <100.00%> (+0.02%)	⬆️
eventindexer	73.82% <ø> (ø)		Carriedforward from 30e5a80
protocol	0.00% <ø> (ø)		Carriedforward from 30e5a80
relayer	59.13% <ø> (ø)		Carriedforward from 30e5a80
ui	100.00% <ø> (ø)		Carriedforward from 30e5a80

*This pull request uses carry forward flags. Click here to find out more.

Impacted Files	Coverage Δ
...ges/bridge-ui/src/relayer-api/RelayerAPIService.ts	100.00% <100.00%> (ø)
packages/bridge-ui/src/utils/toBigNumber.ts	100.00% <100.00%> (ø)

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