Flame Object Cache enhancement

[k82cn]

Motivation

Currently, Flame implements cache in a naive way: it's only using HashMap via rest api. It does not work for large data, and it's not efficient.

Function Specification

Build a dedicated object cache via Arrow Flight & Polars.

Solutions

1. For build-in type, just pickle with RunnerRequest directly
2. For normal object, put to cache after pickle
3. For DataSet/DataFrame, put to cache directly

Additional context

N/A