Refactor Channel Rejoins

[dsrees]

• Rejoin channels whenever a socket opens

[codecov-io]

Codecov Report

Merging #63 into master will increase coverage by 0.08%.
The diff coverage is 77.77%.

@@ Coverage Diff @@## master #63 +/- ##
============================================
+ Coverage 91.23% 91.32% +0.08% + Complexity 179 177 -2 
============================================
Files 9 9 Lines 525 530 +5 Branches 69 71 +2 ============================================
+ Hits 479 484 +5 + Misses 14 13 -1 - Partials 32 33 +1

Impacted Files	Coverage Δ	Complexity Δ
src/main/kotlin/org/phoenixframework/Defaults.kt	100% <ø> (+9.09%)	4 <0> (-1)	⬇️
src/main/kotlin/org/phoenixframework/Channel.kt	94.96% <77.77%> (-1.09%)	53 <1> (-1)
src/main/kotlin/org/phoenixframework/Socket.kt	92.59% <0%> (+0.61%)	70% <0%> (ø)	⬇️

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