Remove old GRPC bash script and convert to python3 (#7454)

* Remove old GRPC bash script and convert to python3

* updated checking gRPC script to python3

scripts/util.py

@@ -0,0 +1,51 @@
+# Copyright 2022 Google Inc. All rights reserved.
+#
+# 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.
+
+import platform
+import subprocess
+from pathlib import Path
+
+# Get the path where this script is located so we can invoke the script from
+# any directory and have the paths work correctly.
+script_path = Path(__file__).parent.resolve()
+
+# Get the root path as an absolute path, so all derived paths are absolute.
+root_path = script_path.parent.absolute()
+
+# Get the location of the flatc executable, reading from the first command line
+# argument or defaulting to default names.
+flatc_exe = Path("flatc" if not platform.system() == "Windows" else "flatc.exe")
+
+# Find and assert flatc compiler is present.
+if root_path in flatc_exe.parents:
+    flatc_exe = flatc_exe.relative_to(root_path)
+flatc_path = Path(root_path, flatc_exe)
+assert flatc_path.exists(), "Cannot find the flatc compiler " + str(flatc_path)
+
+# Execute the flatc compiler with the specified parameters
+def flatc(options, schema, prefix=None, include=None, data=None, cwd=root_path):
+    cmd = [str(flatc_path)] + options
+    if prefix:
+        cmd += ["-o"] + [prefix]
+    if include:
+        cmd += ["-I"] + [include]
+    if isinstance(schema, Path):
+      cmd += [str(schema)]
+    elif isinstance(schema, str):
+      cmd += [schema]
+    else:
+      cmd += schema
+    if data:
+        cmd += [data] if isinstance(data, str) else data
+    return subprocess.check_call(cmd, cwd=str(cwd))