Refactor out use of anyhow

[algesten]

This relates to webrtc-rs/webrtc#106

[codecov]

Codecov Report

Merging #15 (4cef419) into main (fa3858f) will increase coverage by 0.11%.
The diff coverage is 37.93%.

@@            Coverage Diff             @@
##             main      #15      +/-   ##
==========================================
+ Coverage   48.31%   48.42%   +0.11%     
==========================================
  Files          14       14              
  Lines        1393     1398       +5     
  Branches      344      343       -1     
==========================================
+ Hits          673      677       +4     
- Misses        462      464       +2     
+ Partials      258      257       -1     

Impacted Files	Coverage Δ
src/codecs/vp9/vp9_test.rs	87.16% <0.00%> (-0.07%)	⬇️
...udio_level_extension/audio_level_extension_test.rs	71.79% <ø> (ø)
...nsport_cc_extension/transport_cc_extension_test.rs	70.37% <ø> (ø)
src/lib.rs	100.00% <ø> (ø)
src/packet/packet_test.rs	21.84% <0.00%> (+0.04%)	⬆️
src/packetizer/packetizer_test.rs	65.21% <ø> (ø)
src/header.rs	59.90% <33.33%> (ø)
src/error.rs	37.50% <50.00%> (+4.16%)	⬆️
...end_time_extension/abs_send_time_extension_test.rs	71.66% <100.00%> (+3.33%)	⬆️

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