Remove pessimistic String calls for low level logs

[paulwe]

there is no need to manually stringify types that implement fmt.Stringer. if the log line is printed the formatter for %s will do this.

[codecov]

Codecov Report

Attention: Patch coverage is 79.16667% with 5 lines in your changes are missing coverage. Please review.

Project coverage is 68.40%. Comparing base (cf40c33) to head (5528f7b).

❗ Current head 5528f7b differs from pull request most recent head 71ef030. Consider uploading reports for the commit 71ef030 to get more accurate results

Files	Patch %	Lines
client.go	40.00%	3 Missing ⚠️
internal/allocation/allocation.go	80.00%	1 Missing ⚠️
internal/server/turn.go	90.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #389      +/-   ##
==========================================
+ Coverage   68.24%   68.40%   +0.15%     
==========================================
  Files          43       43              
  Lines        2337     2333       -4     
==========================================
+ Hits         1595     1596       +1     
+ Misses        576      573       -3     
+ Partials      166      164       -2     

Flag	Coverage Δ
go	68.40% <79.16%> (+0.15%)	⬆️
wasm	27.64% <0.00%> (+0.04%)	⬆️

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