feat: Trusted Proxies

[LaurenceJJones]

Fix #554

Added the option to configuration to allow trusted proxies, is handled the same way as every other []string

However, I had to find a workaround for unix sockets since there was no "official" way for Gin to handle these.

So in short if the request comes from unix socket then the RemoteAddr is set to 127.0.0.1 so if the user would like to trust a webserver that communicates on the socket then they would need to trust 127.0.0.1 via the new option.

By default the RemoteAddr is set to @ on unix socket requests , however, gin only allows IP's within the trusted proxies

[codecov]

Codecov Report

Attention: 2 lines in your changes are missing coverage. Please review.

Comparison is base (d32d131) 86.89% compared to head (2953d75) 86.81%.

Files	Patch %	Lines
router/router.go	66.66%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #624      +/-   ##
==========================================
- Coverage   86.89%   86.81%   -0.08%     
==========================================
  Files          44       44              
  Lines        1587     1593       +6     
==========================================
+ Hits         1379     1383       +4     
- Misses        124      125       +1     
- Partials       84       85       +1     

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