Fix connCtx.RemoteAddr()

[at-wat]

LocalAddr of the underlying conn was returned from RemoteAddr.
Add TestLocalAddrAndRemoteAddr.

Squash #245 and #246.
Lint errors are fixed.

closes #245
closes #246

[codecov]

Codecov Report

Merging #247 into master will decrease coverage by 0.04%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #247      +/-   ##
==========================================
- Coverage   77.80%   77.75%   -0.05%     
==========================================
  Files          76       76              
  Lines        4037     4037              
==========================================
- Hits         3141     3139       -2     
- Misses        619      620       +1     
- Partials      277      278       +1     

Flag	Coverage Δ
#go	77.79% <100.00%> (-0.03%)	⬇️
#wasm	72.72% <100.00%> (+0.04%)	⬆️

Impacted Files	Coverage Δ
internal/net/connctx/connctx.go	86.41% <100.00%> (-2.47%)	⬇️

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