Working on a python example plus fixing python grpc code (#6456)

Refactored python grpc code gen

Adds example server & client + fixes ci

Fixes generated code

Making sure we encode the reply string as utf8

Adds Readme details to clarify issue regarding encoding when python is sending/receiving

grpc/examples/generate.sh

@@ -38,23 +38,34 @@ fi
 generator="--grpc $current_dir/greeter.fbs"
 
 # Regenerate Go lang code
-cd go/
+cd go
 
 cd greeter
 fbc --go ${generator}
 
 cd ${current_dir}
 
-cd swift/
+# Regenerate Python code
+cd python
+
+cd greeter
+
+fbc --python ${generator}
+
+cd ${current_dir}
+
+# Regenerate Swift code
+cd swift
 
 cd Greeter/Sources/Model
 fbc --swift ${generator}
 
 cd ${current_dir}
 
-cd ts/
+# Regenerate Typescript code
+cd ts
 
 cd greeter/src
 fbc --ts ${generator}
 
-cd ${current_dir}
+cd ${current_dir}