THRIFT-2195 Delphi: Add event handlers for server and processing events

Patch: Jens Geyer
diff --git a/lib/delphi/src/Thrift.Transport.Pipes.pas b/lib/delphi/src/Thrift.Transport.Pipes.pas
index bf07e1e..c2696f4 100644
--- a/lib/delphi/src/Thrift.Transport.Pipes.pas
+++ b/lib/delphi/src/Thrift.Transport.Pipes.pas
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