[#3] Added generate proto script create container method

Signed-off-by: Ilyas Niyazov <i.niyazov@yadro.com>

frostfs_sdk/client/utils/request_constructor.py

@@ -0,0 +1,47 @@
+from google.protobuf.message import Message
+from typing import Dict, Optional
+
+from frostfs_sdk.models.mappers.meta_header_mapper import MetaHeaderMapper
+from frostfs_sdk.models.mappers.session_mapper import SessionMapper
+from frostfs_sdk.models.dto.meta_header import MetaHeader
+from frostfs_sdk.protos.models.session import types_pb2 as types_pb2_session
+
+
+META_HEADER_FIELD_NAME = "meta_header"
+
+
+class RequestConstructor:
+    @staticmethod
+    def add_meta_header(request: Message, x_headers: Optional[Dict[str, str]] = None, session_token: types_pb2_session.SessionToken = None):
+        """
+        Adds a meta header to the request.
+
+        :param request: A Protobuf Message.Builder object.
+        :param x_headers: Optional dictionary of custom headers.
+        :param session_token: Optional session token.
+        :raises ValueError: If the request or required fields are missing.
+        """
+        if request is None:
+            return
+
+        descriptor = request.DESCRIPTOR
+        if getattr(descriptor, META_HEADER_FIELD_NAME) is None:
+            raise ValueError(f"Required Protobuf field is missing: {META_HEADER_FIELD_NAME}")
+
+        meta_header = getattr(request, META_HEADER_FIELD_NAME)
+        if meta_header.ByteSize() > 0:
+            return
+
+        meta_header_builder = MetaHeaderMapper.to_grpc_message(MetaHeader())
+
+        if session_token and session_token.ByteSize() > 0:
+            meta_header_builder.session_token = session_token
+
+        if x_headers:
+            grpc_x_headers = [
+                types_pb2_session.XHeader(key=key, value=value)
+                for key, value in x_headers.items()
+            ]
+            meta_header_builder.x_headers.extend(grpc_x_headers)
+
+        setattr(request, META_HEADER_FIELD_NAME, meta_header_builder.build())