add test and fix bugs for websocket

[suchen-sci]

1. add more test
2. add mock for supervisor
3. fix inherit panic (double registry http.DefaultMux by call http.HandleFunc in Init and Inherit).
4. fix close problem (proxy.server not set)
5. fix tls not work (use ListenAndServeTLS)
6. update copyHeader to copy all headers except ones used in gorilla/websocket

[codecov-commenter]

Codecov Report

Merging #379 (adfa4c7) into main (2988988) will decrease coverage by 0.10%.
The diff coverage is 87.50%.

@@            Coverage Diff             @@
##             main     #379      +/-   ##
==========================================
- Coverage   80.48%   80.38%   -0.11%     
==========================================
  Files          57       60       +3     
  Lines        6637     6888     +251     
==========================================
+ Hits         5342     5537     +195     
- Misses       1008     1058      +50     
- Partials      287      293       +6     

Impacted Files	Coverage Δ
pkg/object/websocketserver/proxy.go	77.83% <87.50%> (ø)
pkg/object/mqttproxy/session.go	74.39% <0.00%> (-7.93%)	⬇️
pkg/object/websocketserver/spec.go	100.00% <0.00%> (ø)
pkg/object/websocketserver/websocket.go	100.00% <0.00%> (ø)

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