feat: Improve copyright information

Signed-off-by: Xinwei Xiong(cubxxw) <3293172751nss@gmail.com>

script/make-rules/copyright.mk

@@ -0,0 +1,59 @@
+# Copyright © 2023 OpenIMSDK.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+# ==============================================================================
+# wget https://github.com/google/addlicense/releases/download/v1.0.0/addlicense_1.0.0_Linux_x86_64.tar.gz
+# Makefile helper functions for copyright
+#
+
+LICENSE_TEMPLATE ?= $(ROOT_DIR)/scripts/LICENSE_TEMPLATE
+
+# TODO: GOBIN -> TOOLS_DIR
+# Questions about go mod instead of go path: https://github.com/kubernetes/kubernetes/issues/117181
+## copyright.verify: Validate boilerplate headers for assign files
+.PHONY: copyright.verify
+copyright.verify: tools.verify.addlicense
+	@echo "===========> Validate boilerplate headers for assign files starting in the $(ROOT_DIR) directory"
+	@$(GOBIN)/addlicense -v -check -ignore **/test/** -f $(LICENSE_TEMPLATE) $(CODE_DIRS)
+	@echo "===========> End of boilerplate headers check..."
+
+## copyright.add: Add the boilerplate headers for all files
+.PHONY: copyright.add
+copyright.add: tools.verify.addlicense
+	@echo "===========> Adding $(LICENSE_TEMPLATE) the boilerplate headers for all files"
+	@$(GOBIN)/addlicense -y $(shell date +"%Y") -v -c "Alibaba Group Holding Ltd." -f $(LICENSE_TEMPLATE) $(CODE_DIRS)
+	@echo "===========> End the copyright is added..."
+
+# Addlicense Flags:
+#   -c string
+#         copyright holder (default "Google LLC")
+#   -check
+#         check only mode: verify presence of license headers and exit with non-zero code if missing
+#   -f string
+#         license file
+#   -ignore value
+#         file patterns to ignore, for example: -ignore **/*.go -ignore vendor/**
+#   -l string
+#         license type: apache, bsd, mit, mpl (default "apache")
+#   -s    Include SPDX identifier in license header. Set -s=only to only include SPDX identifier.
+#   -skip value
+#         [deprecated: see -ignore] file extensions to skip, for example: -skip rb -skip go
+#   -v    verbose mode: print the name of the files that are modified or were skipped
+#   -y string
+#         copyright year(s) (default "2023")
+
+## copyright.help: Show copyright help
+.PHONY: copyright.help
+copyright.help: scripts/make-rules/copyright.mk
+	$(call smallhelp)