Upgrade golangci-lint, more linters

[JoeTurki]

Description

Introduces new linters, upgrade golangci-lint to version (v1.63.4)

Reference issue

pion/.goassets#220

[codecov]

Codecov Report

Attention: Patch coverage is 68.81890% with 198 lines in your changes missing coverage. Please review.

Project coverage is 78.54%. Comparing base (647b978) to head (cad1676).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
gather.go	39.58%	56 Missing and 2 partials ⚠️
tcp_mux.go	20.40%	39 Missing ⚠️
agent.go	78.97%	27 Missing and 10 partials ⚠️
selection.go	77.46%	10 Missing and 6 partials ⚠️
candidate_base.go	80.43%	7 Missing and 2 partials ⚠️
agent_config.go	82.85%	6 Missing ⚠️
agent_stats.go	50.00%	5 Missing and 1 partial ⚠️
udp_mux.go	66.66%	4 Missing and 1 partial ⚠️
active_tcp.go	60.00%	4 Missing ⚠️
net.go	63.63%	2 Missing and 2 partials ⚠️
... and 8 more

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #755      +/-   ##
==========================================
- Coverage   80.01%   78.54%   -1.47%     
==========================================
  Files          41       41              
  Lines        5023     5323     +300     
==========================================
+ Hits         4019     4181     +162     
- Misses        775      912     +137     
- Partials      229      230       +1     

Flag	Coverage Δ
go	78.54% <68.81%> (-1.47%)	⬇️
wasm	26.99% <12.12%> (-0.90%)	⬇️

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