refactor(cordova/apple): simplify OutlineAppleLib

[fortuna]

I'm getting rid of OutlineConnectivity. Note that the Go code already resolves host names (I added tests to demonstrate), so the resolution we were doing was unnecessary.

I stopped passing the terrible OutlineTunnel to some VPN functions, passing a tunnelId and configJson instead. I may rename it transportConfig or something else that reflects it's about the transport only.
I identified a place where we are inspecting the transport config that we should eventually remove.
We need to introduce a new "tunnel config" concept that contains the tunnel id, the transport config and other parameters, but that will be later.

This is part of the effort of making the platform-code agnostic to the config.

/cc @bi-kh FYI

[codecov]

Codecov Report

Patch coverage: 26% and no project coverage change.

Comparison is base (bccebce) 35% compared to head (2ba612e) 36%.

Additional details and impacted files

@@          Coverage Diff           @@
##           master   #1660   +/-   ##
======================================
  Coverage      35%     36%           
======================================
  Files          47      46    -1     
  Lines        2856    2815   -41     
  Branches      314     314           
======================================
+ Hits         1012    1018    +6     
+ Misses       1844    1797   -47     

Flag	Coverage Δ
apple	14% <26%> (+1%)	⬆️
ios	15% <26%> (+1%)	⬆️
macos	14% <26%> (+1%)	⬆️
unittests	36% <26%> (+<1%)	⬆️
www	45% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...eLib/Sources/OutlineTunnelSources/OutlineVpn.swift	0% <0%> (ø)
...ib/Tests/OutlineTunnelTest/OutlineTunnelTest.swift	100% <100%> (ø)

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[jyyi1]

LGTM, but we might lose the error logs for isServerReachable. We should consider adding logs to the go-tun2socks.