[lake/paimon] Introduce scan-based lake table lookuper

[zuston]

Purpose

this is the sub-task for #3631

The SST-based Paimon lake table lookuper introduced in #3632 caches Paimon SST files on TabletServer local disks. This approach can also benefit from future Fluss-level optimizations, such as a global index.

However, for highly sparse lookup workloads, the cache hit ratio can be very low, resulting in frequent file downloads and additional I/O overhead. Scan-based lookup can reduce this overhead by using predicate pushdown to read only the relevant Parquet row groups instead of entire files. This is particularly beneficial when row groups are small relative to the overall Parquet file size.

Brief change log

1. introduce the scan-based lake table lookuper

Tests

API and Format

Documentation