Add the rerank command to the ES|QL grammar.

[afoucret]

Description

This is a draft PR that introduce a new RERANK ES|QL command,

The rerank command use an inference task of type reranker to reorder the rows of the result.

Command syntax:

| RERANK "the quick brown fox" ON title WITH my-reranker

Checklist

• Create grammar for the new command
• Create the logical plan for the command
• Parse the command to a logical plan
• Create the physical plan for the command
• Command planning
• Command execution through an AsyncOperator leveraging the infernce service