feat: add sample app for grpc client mocking

grpc-http-sample/README.md

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+# gRPC & HTTP Server Setup with Keploy
+
+This guide explains how to set up and run the gRPC and HTTP servers using Keploy to capture and test the HTTP calls.
+Here support grpc client (Unary rpc) has been showed, where keploy is recording incoming http calls and outgoing grpc calls. 
+
+## Steps to Run
+
+### 1. Start the gRPC Server
+
+Open a terminal and navigate to the gRPC server directory:
+
+```bash
+cd grpc/grpc-server
+```
+
+Run the gRPC server:
+
+```bash
+go run server.go
+```
+
+### 2. Start the HTTP Server in Record Mode
+
+Open another terminal and navigate to the HTTP server directory:
+
+```bash
+cd http
+```
+
+Build the HTTP server:
+
+```bash
+go build -o httpserver
+```
+
+Run the HTTP server in record mode to capture the incoming HTTP calls and outgoing gRPC client calls:
+
+```bash
+keploy record -c "httpserver"
+```
+
+Make a curl request to the http server :
+```bash
+curl "http://localhost:8080/hello?name=Jack"
+```
+
+### 3. Run the HTTP Server in Test Mode
+
+After recording, run the HTTP server in test mode to replay the captured calls:
+
+```bash
+keploy test -c "httpserver"
+```
+
+---

grpc-http-sample/go.mod

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+module github.com/Sarthak160/grpc-http-sample
+
+go 1.22.1
+
+require (
+	google.golang.org/grpc v1.67.1
+	google.golang.org/protobuf v1.35.1
+)
+
+require (
+	golang.org/x/net v0.28.0 // indirect
+	golang.org/x/sys v0.24.0 // indirect
+	golang.org/x/text v0.17.0 // indirect
+	google.golang.org/genproto/googleapis/rpc v0.0.0-20240814211410-ddb44dafa142 // indirect
+)

grpc-http-sample/go.sum

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+github.com/google/go-cmp v0.6.0 h1:ofyhxvXcZhMsU5ulbFiLKl/XBFqE1GSq7atu8tAmTRI=
+github.com/google/go-cmp v0.6.0/go.mod h1:17dUlkBOakJ0+DkrSSNjCkIjxS6bF9zb3elmeNGIjoY=
+golang.org/x/net v0.28.0 h1:a9JDOJc5GMUJ0+UDqmLT86WiEy7iWyIhz8gz8E4e5hE=
+golang.org/x/net v0.28.0/go.mod h1:yqtgsTWOOnlGLG9GFRrK3++bGOUEkNBoHZc8MEDWPNg=
+golang.org/x/sys v0.24.0 h1:Twjiwq9dn6R1fQcyiK+wQyHWfaz/BJB+YIpzU/Cv3Xg=
+golang.org/x/sys v0.24.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
+golang.org/x/text v0.17.0 h1:XtiM5bkSOt+ewxlOE/aE/AKEHibwj/6gvWMl9Rsh0Qc=
+golang.org/x/text v0.17.0/go.mod h1:BuEKDfySbSR4drPmRPG/7iBdf8hvFMuRexcpahXilzY=
+google.golang.org/genproto/googleapis/rpc v0.0.0-20240814211410-ddb44dafa142 h1:e7S5W7MGGLaSu8j3YjdezkZ+m1/Nm0uRVRMEMGk26Xs=
+google.golang.org/genproto/googleapis/rpc v0.0.0-20240814211410-ddb44dafa142/go.mod h1:UqMtugtsSgubUsoxbuAoiCXvqvErP7Gf0so0mK9tHxU=
+google.golang.org/grpc v1.67.1 h1:zWnc1Vrcno+lHZCOofnIMvycFcc0QRGIzm9dhnDX68E=
+google.golang.org/grpc v1.67.1/go.mod h1:1gLDyUQU7CTLJI90u3nXZ9ekeghjeM7pTDZlqFNg2AA=
+google.golang.org/protobuf v1.35.1 h1:m3LfL6/Ca+fqnjnlqQXNpFPABW1UD7mjh8KO2mKFytA=
+google.golang.org/protobuf v1.35.1/go.mod h1:9fA7Ob0pmnwhb644+1+CVWFRbNajQ6iRojtC/QF5bRE=

grpc-http-sample/grpc/example.proto

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+syntax = "proto3";
+
+package example;
+
+option go_package = "grpc-server/example;example"; // <- This line is important
+
+service ExampleService {
+  rpc SayHello (HelloRequest) returns (HelloResponse);
+}
+
+message HelloRequest {
+  string name = 1;
+}
+
+message HelloResponse {
+  string message = 1;
+}