fix #865 Remove HttpToH2Operations in favour of Http2StreamFrameToHttpObjectCodec

[violetagg]

Http2StreamFrameToHttpObjectCodec is invoked after Http2StreamBridgeHandler
and before ChannelOperationsHandler.
When the message is delivered to Http*Operations class it is already HttpObject

[codecov-io]

Codecov Report

Merging #874 into 0.8.x will increase coverage by 0.19%.
The diff coverage is 0%.

@@             Coverage Diff              @@
##              0.8.x     #874      +/-   ##
============================================
+ Coverage     66.22%   66.42%   +0.19%     
+ Complexity     1393     1392       -1     
============================================
  Files           134      133       -1     
  Lines          6516     6495      -21     
  Branches        855      852       -3     
============================================
- Hits           4315     4314       -1     
+ Misses         1746     1726      -20     
  Partials        455      455

Impacted Files	Coverage Δ	Complexity Δ
...eactor/netty/http/server/HttpServerOperations.java	71.18% <0%> (-0.92%)	63 <0> (ø)
...or/netty/http/server/Http2StreamBridgeHandler.java	0% <0%> (ø)	0 <0> (ø)	⬇️
...eactor/netty/channel/ChannelOperationsHandler.java	79.62% <0%> (-1.86%)	11% <0%> (-1%)
...ctor/netty/resources/PooledConnectionProvider.java	79.56% <0%> (ø)	21% <0%> (ø)	⬇️

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