Add week 2 materials

materials/02-communication/grpc-streaming/server/queue_pb2.pyi

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+from google.protobuf import timestamp_pb2 as _timestamp_pb2
+from google.protobuf import descriptor as _descriptor
+from google.protobuf import message as _message
+from typing import ClassVar as _ClassVar, Mapping as _Mapping, Optional as _Optional, Union as _Union
+
+DESCRIPTOR: _descriptor.FileDescriptor
+
+class Value(_message.Message):
+    __slots__ = ["payload", "updated_at"]
+    PAYLOAD_FIELD_NUMBER: _ClassVar[int]
+    UPDATED_AT_FIELD_NUMBER: _ClassVar[int]
+    payload: int
+    updated_at: _timestamp_pb2.Timestamp
+    def __init__(self, payload: _Optional[int] = ..., updated_at: _Optional[_Union[_timestamp_pb2.Timestamp, _Mapping]] = ...) -> None: ...
+
+class PushRequest(_message.Message):
+    __slots__ = ["value"]
+    VALUE_FIELD_NUMBER: _ClassVar[int]
+    value: Value
+    def __init__(self, value: _Optional[_Union[Value, _Mapping]] = ...) -> None: ...
+
+class PushResponse(_message.Message):
+    __slots__ = []
+    def __init__(self) -> None: ...
+
+class PopRequest(_message.Message):
+    __slots__ = []
+    def __init__(self) -> None: ...
+
+class PopResponse(_message.Message):
+    __slots__ = ["value"]
+    VALUE_FIELD_NUMBER: _ClassVar[int]
+    value: Value
+    def __init__(self, value: _Optional[_Union[Value, _Mapping]] = ...) -> None: ...
+
+class DrainRequest(_message.Message):
+    __slots__ = []
+    def __init__(self) -> None: ...