feat(profiles): implement Environment#availableNetworks to expose available networks

[faustbrian]

Resolves #518

[codecov]

Codecov Report

Merging #523 into master will increase coverage by 0.23%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #523      +/-   ##
==========================================
+ Coverage   69.08%   69.31%   +0.23%     
==========================================
  Files          58       57       -1     
  Lines        1174     1170       -4     
  Branches       85       81       -4     
==========================================
  Hits          811      811              
+ Misses        331      329       -2     
+ Partials       32       30       -2     

Flag	Coverage Δ
#unit	69.31% <100.00%> (+0.23%)	⬆️

Impacted Files	Coverage Δ
packages/platform-sdk-profiles/src/env.ts	88.00% <100.00%> (+1.95%)	⬆️
packages/platform-sdk-coincap/src/utils.ts

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