Remove grpc

[melowe]

Remove GRPC from project and add .gradle to git ignore.

[codecov-io]

Codecov Report

Merging #926 into master will decrease coverage by 0.03%.
The diff coverage is 100%.

@@             Coverage Diff             @@
##             master    #926      +/-   ##
===========================================
- Coverage     99.34%   99.3%   -0.04%     
+ Complexity     2168    2077      -91     
===========================================
  Files           327     311      -16     
  Lines          6064    5786     -278     
  Branches        334     327       -7     
===========================================
- Hits           6024    5746     -278     
  Misses            5       5              
  Partials         35      35

Impacted Files	Coverage Δ	Complexity Δ
...c/main/java/com/quorum/tessera/config/AppType.java	100% <100%> (ø)	3 <0> (ø)	⬇️
.../quorum/tessera/config/DeprecatedServerConfig.java	100% <100%> (ø)	16 <0> (-3)	⬇️
...a/com/quorum/tessera/config/CommunicationType.java	100% <100%> (ø)	1 <0> (ø)	⬇️
.../quorum/tessera/grpc/p2p/PartyInfoGrpcService.java
...a/com/quorum/tessera/client/GrpcClientFactory.java
...java/com/quorum/tessera/client/GrpcClientImpl.java
...om/quorum/tessera/grpc/StreamObserverTemplate.java
...n/java/com/quorum/tessera/grpc/p2p/P2PGrpcApp.java
...om/quorum/tessera/grpc/p2p/TesseraGrpcService.java
...n/java/com/quorum/tessera/grpc/api/Q2TGrpcApp.java
... and 9 more

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