Replace delegate based server impl with call handler

[marcoferrer]

No description provided.

[codecov]

Codecov Report

Merging #102 into master will decrease coverage by 22.5%.
The diff coverage is 89.21%.

@@              Coverage Diff              @@
##             master     #102       +/-   ##
=============================================
- Coverage      87.8%   65.29%   -22.51%     
- Complexity       21       22        +1     
=============================================
  Files            16       19        +3     
  Lines           369      608      +239     
  Branches         50       75       +25     
=============================================
+ Hits            324      397       +73     
- Misses           26      183      +157     
- Partials         19       28        +9

Impacted Files	Coverage Δ	Complexity Δ
...us/coroutines/client/ClientStreamingCallChannel.kt	100% <ø> (+18.18%)	0 <0> (ø)	⬇️
...oferrer/krotoplus/coroutines/server/ServerCalls.kt	5.81% <ø> (-82.56%)	0 <0> (ø)
.../marcoferrer/krotoplus/coroutines/call/CallExts.kt	89.74% <100%> (+4.89%)	0 <0> (ø)	⬇️
...s/coroutines/server/DeferredCancellationHandler.kt	78.57% <78.57%> (ø)	5 <5> (?)
...oplus/coroutines/client/ClientResponseObservers.kt	80.55% <80.55%> (ø)	0 <0> (?)
...rer/krotoplus/coroutines/call/CallReadyObserver.kt	93.33% <93.33%> (ø)	7 <7> (?)
.../krotoplus/coroutines/server/ServerCallHandlers.kt	95.08% <95.08%> (ø)	0 <0> (?)
...oferrer/krotoplus/coroutines/client/ClientCalls.kt	89.85% <95.12%> (-1.06%)	0 <0> (ø)
...otoplus/coroutines/client/ClientBidiCallChannel.kt	6.66% <0%> (-90%)	0% <0%> (ø)
... and 9 more

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