test(VoiceUDPSocket): unit tests

[amishshah]

Please describe the changes this PR makes and why it should be merged:

Adds unit tests to VoiceUDPSocket, and also fixes an issue raised in testing. Previously, if an unexpected message was received on the socket during IP discovery, then an unhandled error would be thrown. This has been fixed, the caller of the parsing function now handles errors by discarding bad packets. The parsing function also validates the IP address.

Status and versioning classification:

• Code changes have been tested against the Discord API, or there are no code changes

[codecov[bot]]

Codecov Report

Merging #82 (3369f25) into main (f140bd4) will increase coverage by 3.50%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main      #82      +/-   ##
==========================================
+ Coverage   44.01%   47.52%   +3.50%     
==========================================
  Files          15       15              
  Lines         602      606       +4     
  Branches      133      134       +1     
==========================================
+ Hits          265      288      +23     
+ Misses        335      316      -19     
  Partials        2        2              

Impacted Files	Coverage Δ
src/networking/VoiceUDPSocket.ts	95.83% <100.00%> (+95.83%)	:arrow_up:

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[amishshah]

Addressed code review @kyranet. As for the malformed packet test, I realised this situation could never actually occur, so I removed the check.