[Metadata] The microservices should split in sub folders

[LucasClaisse]

The MS architecture does not seems right.

The MS should be compose of:

• 1 main.py with a function call to init gRPC
• 1 folder grpc with all the gRPC features
• 1 folder handlers (if there are HTTP requests on the MS)
• 1 folder internal with rhe internal function (often called by gRPC or kafka)
• 1 folder data with all the data structures

The folder architecture should look like any other MS, even if it is in an other language.

[LucasClaisse]

There are some typo in the python files
(1 found)
metadata_grpc.py L18
add_MetadataServicer_to_server