issues/88: create middleware that adds the real client IP address

[komuw]

What:

• Create middleware that adds the real client IP address
  Note that this is on a best effort basis. Finding the true client IP address is a precarious process[1]

Why:

• Fixes: taken account of X-Forwarded-For header #88

Ref:

1. https://adam-p.ca/blog/2022/03/x-forwarded-for/

[codecov-commenter]

Codecov Report

Base: 72.25% // Head: 72.52% // Increases project coverage by +0.27% 🎉

Coverage data is based on head (4509790) compared to base (c9fdb51).
Patch coverage: 80.50% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #187      +/-   ##
==========================================
+ Coverage   72.25%   72.52%   +0.27%     
==========================================
  Files          31       33       +2     
  Lines        2076     2224     +148     
==========================================
+ Hits         1500     1613     +113     
- Misses        506      531      +25     
- Partials       70       80      +10     

Impacted Files	Coverage Δ
middleware/csrf.go	100.00% <ø> (ø)
server/server.go	45.56% <ø> (ø)
sess/sess.go	83.33% <ø> (ø)
internal/clientip/client_ip.go	70.67% <70.67%> (ø)
cookie/cookie.go	79.81% <100.00%> (+3.66%)	⬆️
middleware/client_ip.go	100.00% <100.00%> (ø)
middleware/log.go	79.12% <100.00%> (-0.67%)	⬇️
middleware/middleware.go	100.00% <100.00%> (ø)
middleware/panic.go	93.33% <100.00%> (-0.61%)	⬇️
middleware/ratelimiter.go	95.58% <100.00%> (-0.13%)	⬇️

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