Convert string to int for integer type

[Oreoxmt]

int32 port = 1 [(grpc.gateway.protoc_gen_openapiv2.options.openapiv2_field) = {
    format: "int32",
    default: "8080",
    example: "8080"

The output:

"port":{
  "type": "integer",
  "format": "int32",
  "example": 8080,
  "default": "8080"
}

Expected output:

"port":{
  "type": "integer",
  "format": "int32",
  "example": 8080,
  "default": 8080
}

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