feat(profiles): implement Contact#avatar

[dated]

Summary

Implements Contact#avatar.

Checklist

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

[codecov]

Codecov Report

Merging #613 into master will increase coverage by 0.07%.
The diff coverage is 83.33%.

@@            Coverage Diff             @@
##           master     #613      +/-   ##
==========================================
+ Coverage   64.05%   64.12%   +0.07%     
==========================================
  Files          83       83              
  Lines        1555     1561       +6     
  Branches      142      142              
==========================================
+ Hits          996     1001       +5     
- Misses        524      525       +1     
  Partials       35       35              

Flag	Coverage Δ
#unit	64.12% <83.33%> (+0.07%)	⬆️

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Impacted Files	Coverage Δ
packages/platform-sdk-profiles/src/contact.ts	85.71% <83.33%> (-0.65%)	⬇️

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