[grpc][Gpr_To_Absl_Logging] Migrating from gpr to absl logging - gpr_log
In this CL we are migrating from gRPCs own gpr logging mechanism to absl logging mechanism. The intention is to deprecate gpr_log in the future.
We have the following mapping
1. gpr_log(GPR_INFO,...) -> LOG(INFO)
2. gpr_log(GPR_ERROR,...) -> LOG(ERROR)
3. gpr_log(GPR_DEBUG,...) -> VLOG(2)
Reviewers need to check :
1. If the above mapping is correct.
2. The content of the log is as before.
gpr_log format strings did not use string_view or std::string . absl LOG accepts these. So there will be some elimination of string_view and std::string related conversions. This is expected.
Closes#36636
COPYBARA_INTEGRATE_REVIEW=https://github.com/grpc/grpc/pull/36636 from tanvi-jagtap:regex_test_cpp f2cac9c5a49f8d6025989160b9d9d6954dc8cc2d
PiperOrigin-RevId: 634954173
Add flag error_tolerence to define the search stopping criteria.
Move the equal condition in the binary search to smaller than condition.
Wrap get_cpu_usage(), so on non-linux platform, the compiler won't
complain and will get cpu usage to be 0.
