Add server config support with basic default implementation

[flimzy]

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[codecov]

Codecov Report

Attention: 22 lines in your changes are missing coverage. Please review.

Comparison is base (e57e528) 77.39% compared to head (dfc4efe) 77.33%.

❗ Current head dfc4efe differs from pull request most recent head c919fc8. Consider uploading reports for the commit c919fc8 to get more accurate results

Files	Patch %	Lines
x/server/config.go	60.71%	11 Missing and 11 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #847      +/-   ##
==========================================
- Coverage   77.39%   77.33%   -0.07%     
==========================================
  Files         200      201       +1     
  Lines       14566    14621      +55     
==========================================
+ Hits        11274    11307      +33     
- Misses       2821     2832      +11     
- Partials      471      482      +11     

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