Added a disconnect method for the socket.io socket

[1c3t3a]

The current implementation missed a disconnection ability for the socket.io socket, as mentioned in #43.

[codecov]

Codecov Report

Merging #44 (9448467) into main (2b950b6) will decrease coverage by 0.32%.
The diff coverage is 72.00%.

@@            Coverage Diff             @@
##             main      #44      +/-   ##
==========================================
- Coverage   87.73%   87.41%   -0.33%     
==========================================
  Files           9        9              
  Lines        1305     1327      +22     
==========================================
+ Hits         1145     1160      +15     
- Misses        160      167       +7     

Impacted Files	Coverage Δ
src/socketio/transport.rs	73.64% <68.18%> (-0.78%)	⬇️
src/lib.rs	98.95% <100.00%> (+0.03%)	⬆️

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