feat(profiles): store exchange currency in wallet data

[dated]

Summary

• Stores the exchange currency in addition to the exchange rate on a wallet.

• Updates the market service to fetch each coins exchange rate only once per profile.

Checklist

• Documentation (if necessary)
• Tests (if necessary)
• Ready to be merged

[codecov]

Codecov Report

Merging #690 into master will increase coverage by 0.03%.
The diff coverage is 88.88%.

@@            Coverage Diff             @@
##           master     #690      +/-   ##
==========================================
+ Coverage   63.04%   63.08%   +0.03%     
==========================================
  Files         104      104              
  Lines        2200     2205       +5     
  Branches      240      240              
==========================================
+ Hits         1387     1391       +4     
- Misses        733      734       +1     
  Partials       80       80              

Flag	Coverage Δ
#unit	63.08% <88.88%> (+0.03%)	⬆️

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Impacted Files	Coverage Δ
...ckages/platform-sdk-profiles/src/wallets/wallet.ts	60.91% <0.00%> (-0.36%)	⬇️
.../src/environment/services/exchange-rate-service.ts	94.73% <100.00%> (+0.98%)	⬆️
...platform-sdk-profiles/src/wallets/wallet.models.ts	100.00% <100.00%> (ø)

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