Create and use middlewares

[Assem-Hafez]

Summary

Create middleware utility to encapsulate reusable logic before rest apis.

Middlewares design

• Each middleware can return either a NextResponse, null, undefined or a tuple representing [key,value] to add to the context.
• If a middleware returned a NextResponse remaining middlewares wont execute and the value is returned.
• If a context tuple is returned it will be added to the current context object and passed to the next middleware.
• After all middlewares are executed an non of them return NextResponse the handler would be invoked with the computed context.

Changes

• Create middlewares util
• Create grpc methods middleware
• grpc methods middleware can accept grpcMetadata from the context
• refactor grpc-client