Refactor out use of anyhow

[algesten]

This is part of webrtc-rs/webrtc#106

[codecov]

Codecov Report

Merging #7 (f818793) into main (d6e25e6) will decrease coverage by 1.63%.
The diff coverage is 18.18%.

@@            Coverage Diff             @@
##             main       #7      +/-   ##
==========================================
- Coverage   67.44%   65.80%   -1.64%     
==========================================
  Files          17       17              
  Lines        1281     1281              
  Branches      304      304              
==========================================
- Hits          864      843      -21     
- Misses        143      164      +21     
  Partials      274      274              

Impacted Files	Coverage Δ
examples/stun_client.rs	0.00% <0.00%> (ø)
src/addr/addr_test.rs	57.31% <0.00%> (-2.46%)	⬇️
src/agent/agent_test.rs	46.39% <0.00%> (-3.61%)	⬇️
src/error.rs	0.00% <0.00%> (-60.00%)	⬇️
src/error_code.rs	0.00% <0.00%> (ø)
src/lib.rs	100.00% <ø> (ø)
src/textattrs/textattrs_test.rs	65.14% <0.00%> (-0.97%)	⬇️
src/xoraddr/xoraddr_test.rs	71.94% <0.00%> (-0.21%)	⬇️
src/message/message_test.rs	83.01% <66.66%> (ø)
src/checks.rs	100.00% <100.00%> (ø)
... and 1 more

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