feat(rust/sedona): Auto-configure spilled batch in-memory size threshold based on global memory limit

[Kontinuation]

Summary

• Automatically configure the spilled_batch_in_memory_size_threshold based on the global memory limit, setting it to 5% of the per-partition memory limit (with a minimum of 10MB).
• This is a by-product of writing documentation for configuring memory management and spilling (docs: add memory management and spill configuration guide #679). We decided to configure this option automatically instead of requiring users to set it up manually based on the global memory limit.