feat(dcs): support TCP obfuscated only DCs

[tdakkota]

No description provided.

[codecov]

Codecov Report

Merging #561 (f1ec4d6) into main (a99c613) will decrease coverage by 0.63%.
The diff coverage is 29.80%.

@@            Coverage Diff             @@
##             main     #561      +/-   ##
==========================================
- Coverage   70.02%   69.39%   -0.64%     
==========================================
  Files         384      384              
  Lines       17476    17550      +74     
==========================================
- Hits        12238    12179      -59     
- Misses       4481     4614     +133     
  Partials      757      757              

Impacted Files	Coverage Δ
internal/mtproxy/faketls/faketls.go	0.00% <0.00%> (ø)
internal/mtproxy/obfuscator/obfuscator.go	0.00% <0.00%> (ø)
telegram/dcs/mtproxy.go	0.00% <0.00%> (ø)
telegram/dcs/plain.go	47.36% <26.56%> (-17.64%)	⬇️
internal/mtproxy/secret.go	73.17% <47.61%> (-26.83%)	⬇️
internal/mtproxy/obfuscated2/obfuscated2.go	79.31% <100.00%> (ø)
telegram/dcs/find.go	100.00% <100.00%> (ø)
telegram/dcs/websocket.go	61.22% <100.00%> (-0.78%)	⬇️
telegram/updates/update.go	9.52% <0.00%> (-61.91%)	⬇️
telegram/updates/state_apply.go	25.00% <0.00%> (-11.72%)	⬇️
... and 11 more

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