Remove LambdaSubscriber wrapping and use subscribe directly

[cbornet]

Or was there a reason not to use the API directly ?

[salesforce-cla]

Thanks for the contribution! Before we can merge this, we need @cbornet to sign the Salesforce Contributor License Agreement.

[codecov]

Codecov Report

Merging #61 into master will not change coverage.
The diff coverage is 0%.

@@            Coverage Diff            @@
##             master      #61   +/-   ##
=========================================
  Coverage     58.25%   58.25%           
  Complexity      188      188           
=========================================
  Files            40       40           
  Lines           915      915           
  Branches         67       67           
=========================================
  Hits            533      533           
  Misses          359      359           
  Partials         23       23

Impacted Files	Coverage Δ	Complexity Δ
...n/java/com/salesforce/rxgrpc/stub/ServerCalls.java	0% <0%> (ø)	0 <0> (ø)	⬇️

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[rmichela]

Is this to make it easier to split out the reactive code?

[cbornet]

No. It's just to simplify the code.