Enhance Host Identification and Metadata Fetching in MachineInfoUtil

[quzard]

This pull request introduces several changes to the MachineInfoUtil module, focusing on enhancing the handling of host identification and metadata fetching. The key changes include the addition of new functions for serial number retrieval, improvements to the ECS metadata fetching process, and the introduction of a new host ID tag.

Enhancements to host identification:

• core/common/MachineInfoUtil.cpp: Added functions GetSerialNumberFromEcsAssist, GetEcsAssistMachineIdFile, GetLocalHostId, and FetchHostId to improve host identification and retrieval of the serial number from ECS assist.
• core/constants/Constants.cpp, core/constants/Constants.h: Introduced a new constant LOG_RESERVED_KEY_HOSTID for logging the host ID. [1] [2]
• core/plugin/processor/inner/ProcessorTagNative.cpp: Added a feature to enable host ID tagging in logs when the enable_host_id flag is set. [1] [2]

Improvements to metadata fetching:

• core/common/MachineInfoUtil.cpp: Enhanced the FetchECSMeta function to include token-based authentication and improved error handling during metadata retrieval.

Code organization and cleanup:

• core/common/MachineInfoUtil.cpp: Added missing includes for boost/filesystem.hpp and common/FileSystemUtil.h. [1] [2]
• core/common/MachineInfoUtil.h: Reorganized includes for rapidjson headers and added a declaration for the new FetchHostId function. [1] [2]