Find the gRPC package correctly

[lidongze0629]

This PR fixes the failure during compiling graphlearn with the vineyard package by:

• Correctly the behavior in FindGRPC.cmake to find the gRPC package
• Find vineyard before gRPC to fix the the problem in cmake: gRPC::grpc++_reflection target already exists.

cmake -DCMAKE_INSTALL_PREFIX=/opt/graphscope         -DKNN=OFF         -DWITH_VINEYARD=ON         -DTESTING=OFF ..
-- The CXX compiler identification is GNU 11.4.0
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Check for working CXX compiler: /usr/bin/c++ - skipped
-- Detecting CXX compile features
-- Detecting CXX compile features - done
-- Looking for C++ include pthread.h
-- Looking for C++ include pthread.h - found
-- Performing Test CMAKE_HAVE_LIBC_PTHREAD
-- Performing Test CMAKE_HAVE_LIBC_PTHREAD - Success
-- Found Threads: TRUE
-- Found Glog: /usr/include
-- Found glog    (include: /usr/include, library: /usr/lib/x86_64-linux-gnu/libglog.so)
-- Found GFlags: /usr/include
-- Found gflags  (include: /usr/include, library: /usr/lib/x86_64-linux-gnu/libgflags.so)
-- Found gRPC: /usr/lib/x86_64-linux-gnu/libgpr.so
Graph-learn is built with vineyard support.
-- Checking for modules 'libbrotlicommon;libbrotlienc;libbrotlidec'
--   Found libbrotlicommon, version 1.0.9
--   Found libbrotlienc, version 1.0.9
--   Found libbrotlidec, version 1.0.9
-- Checking for module 'thrift'
--   Found thrift, version 0.16.0
-- Checking for module 'liblz4'
--   Found liblz4, version 1.9.3
-- Checking for module 'libzstd'
--   Found libzstd, version 1.4.8
-- Zstandard library: /usr/lib/x86_64-linux-gnu/libzstd.so
-- Zstandard include directory: /usr/include
-- Checking for module 're2'
--   Found re2, version 0.0.0
-- Checking for module 'grpc++'
--   Found grpc++, version 1.30.2
CMake Error at /usr/lib/x86_64-linux-gnu/cmake/Arrow/FindgRPCAlt.cmake:85 (add_library):
  add_library cannot create imported target "gRPC::grpc++" because another
  target with the same name already exists.
Call Stack (most recent call first):
  /usr/share/cmake-3.22/Modules/CMakeFindDependencyMacro.cmake:47 (find_package)
  /usr/lib/x86_64-linux-gnu/cmake/Arrow/ArrowConfig.cmake:115 (find_dependency)
  /opt/vineyard/lib/cmake/vineyard/vineyard-config.cmake:42 (find_package)
  CMakeLists.txt:298 (find_package)


CMake Error at /usr/lib/x86_64-linux-gnu/cmake/Arrow/FindgRPCAlt.cmake:94 (add_library):
  add_library cannot create imported target "gRPC::grpc++_reflection" because
  another target with the same name already exists.
Call Stack (most recent call first):
  /usr/share/cmake-3.22/Modules/CMakeFindDependencyMacro.cmake:47 (find_package)
  /usr/lib/x86_64-linux-gnu/cmake/Arrow/ArrowConfig.cmake:115 (find_dependency)
  /opt/vineyard/lib/cmake/vineyard/vineyard-config.cmake:42 (find_package)
  CMakeLists.txt:298 (find_package)


CMake Error at /usr/lib/x86_64-linux-gnu/cmake/Arrow/FindgRPCAlt.cmake:100 (add_executable):
  add_executable cannot create imported target "gRPC::grpc_cpp_plugin"
  because another target with the same name already exists.
Call Stack (most recent call first):
  /usr/share/cmake-3.22/Modules/CMakeFindDependencyMacro.cmake:47 (find_package)
  /usr/lib/x86_64-linux-gnu/cmake/Arrow/ArrowConfig.cmake:115 (find_dependency)
  /opt/vineyard/lib/cmake/vineyard/vineyard-config.cmake:42 (find_package)
  CMakeLists.txt:298 (find_package)


-- Found libgrapelite: /opt/vineyard/lib/cmake/libgrapelite/libgrapelite-config.cmake (found version "0.3.1")
-- Found vineyard: /opt/vineyard/lib/cmake/vineyard/vineyard-config.cmake (found version "0.16.4")
-- Performing Test HAS_STDCXX_17
-- Performing Test HAS_STDCXX_17 - Success
-- Configuring incomplete, errors occurred!
See also "/home/graphscope/GraphScope/learning_engine/graph-learn/graphlearn/cmake-build/CMakeFiles/CMakeOutput.log".