Allow CORS Configuration Via Config File

[bonedaddy]

👷 Purpose

Instead of having to update the cors allowed origins and recompile, provide it with the config file.
Needs RTradeLtd/config#25 merged first

🚀 Changes

• When building the api middleware, check to see if CORS have been provided, otherwise use sane defaults.
• When loading the CORS middleware, we provide the origins we want to allow

⚠️ Breaking Changes

None

[codecov]

Codecov Report

Merging #321 into master will decrease coverage by 0.02%.
The diff coverage is 57.15%.

@@            Coverage Diff             @@
##           master     #321      +/-   ##
==========================================
- Coverage   53.14%   53.12%   -0.01%     
==========================================
  Files          41       41              
  Lines        3700     3705       +5     
==========================================
+ Hits         1966     1968       +2     
- Misses       1331     1332       +1     
- Partials      403      405       +2

Impacted Files	Coverage Δ
api/middleware/cors.go	100% <100%> (ø)	⬆️
api/v2/api.go	85.2% <50%> (-0.69%)	⬇️

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