This includes:
* All of the code in Source/santa_driver containing the kernel extension
* The SNTDriverManager event provider
* All workflows in our CI related to testing if the driver builds
* Installation of the driver in install.sh. Note that code uninstalling existing instances of the driver is still intentionally kept present.
* Kernel extension-specific build rules
* Renames SNTKernelCommon to SNTCommon
* Driver version output from santactl version
* The [SNTConfigurator EnableSystemExtension] configuration key
* Reorder init lists for -Wreorder-init-lists
* Add nullability annotations to the rest of EndpointSecurityTestUtil
* Added fake uses for -Wunused-variable
* Corrected signed/unsigned int conversions in SNTPrefixTree
* Explicitly convert implicit conversions in Santacache
* Set bazelrc to -Werror -Wall
