* Put C++ sdk out of milvus/core

* Delete core/src/sdk

* Add clang-format for c++ sdk

* Add README.md for sdk

* Server unittest run failed on low-end server

* set gpu_cache_capacity to 1G

* #715 fix Milvus crash when searching and building index simultaneously using SQ8H

* #715 fix update

Add Codecov on Github Actions

* (feat): add libfiu for fault injection

* (feat): change libfiu from static to shared

* (feat): install libfiu

add customization option in build.sh

Add CentOS 7 build case on Jenkins CI