webrtc: allow using special characters in ICE server credentials (#1953)

[aler9]

Fixes #1953

[codecov]

Codecov Report

Merging #2000 (e2dc258) into main (059ca76) will increase coverage by 0.01%.
The diff coverage is 63.04%.

❗ Current head e2dc258 differs from pull request most recent head 660a57c. Consider uploading reports for the commit 660a57c to get more accurate results

@@            Coverage Diff             @@
##             main    #2000      +/-   ##
==========================================
+ Coverage   62.19%   62.20%   +0.01%     
==========================================
  Files         108      108              
  Lines       11332    11357      +25     
==========================================
+ Hits         7048     7065      +17     
- Misses       3782     3787       +5     
- Partials      502      505       +3     

Impacted Files	Coverage Δ
internal/conf/auth_method.go	27.27% <ø> (ø)
internal/conf/hls_variant.go	0.00% <ø> (ø)
internal/conf/ips_or_cidrs.go	0.00% <ø> (ø)
internal/conf/log_destination.go	0.00% <ø> (ø)
internal/conf/log_level.go	17.64% <ø> (ø)
internal/conf/rtsp_range_type.go	0.00% <ø> (ø)
internal/conf/source_protocol.go	0.00% <ø> (ø)
internal/conf/string_duration.go	37.50% <ø> (ø)
internal/conf/string_size.go	0.00% <ø> (ø)
internal/core/webrtc_manager.go	66.92% <46.15%> (+2.89%)	⬆️
... and 5 more

... and 5 files with indirect coverage changes

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