feat(profiles): implement exchange rate fetching

[faustbrian]

Resolves #512

[codecov]

Codecov Report

Merging #513 into master will decrease coverage by 0.15%.
The diff coverage is 42.85%.

@@            Coverage Diff             @@
##           master     #513      +/-   ##
==========================================
- Coverage   69.38%   69.22%   -0.16%     
==========================================
  Files          57       57              
  Lines        1166     1173       +7     
  Branches       83       85       +2     
==========================================
+ Hits          809      812       +3     
- Misses        325      329       +4     
  Partials       32       32              

Flag	Coverage Δ
#unit	69.22% <42.85%> (-0.16%)	⬇️

Impacted Files	Coverage Δ
packages/platform-sdk-profiles/src/profile.ts	84.90% <42.85%> (-6.40%)	⬇️

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