Deprecate the lite-init-stats configuration

[hawkingrei]

Enhancement

TL;DR

The lite-init-stats is good enough, and there is no need for non-lite-init-stats. 

The lite-init-stats configuration was introduced to provide a lightweight way to initialize statistics for query optimization. However, with the evolution of our system and the improvements in the sync load mechanism, the necessity of lite-init-stats has diminished.

Sufficient Completeness of Sync Load

• current sync load mechanism has been significantly enhanced and is now robust enough to handle the initialization of statistics without the need for a lightweight alternative. It ensures that statistics are loaded efficiently and accurately, even under various workloads and scenarios.

• The previous concerns about sync load potentially causing timeouts have been addressed. The system now has better timeout handling and resource management, making it a reliable method for initializing statistics.

Memory and Complexity Considerations

• non lite-init-stats will use more memory and load unnecessary data into memory.
• Because we need to manage stats status into memory to control whether it need to sync load. so it will add more complexity.

Documentation and User Guidance

• The documentation has already been updated to remove recommendations for disabling lite-init-stats. This indicates a shift in our guidance towards using the more comprehensive and reliable lite initialization method.

• Users are now encouraged to rely on the default statistics initialization mechanism, which aligns with the improvements in sync load and the overall system performance.