feat(core, jdbc): introduce a JDBC indexer

[loicmathieu]

Fixes #988
This is a WIP PR to introduce an indexer in JDBC.

This indexes logs, metric and executions in realtime.

A simple flow shows more than 20% perf improvement, more is expected in production as locally logs are in send to the console which is known to be not good in term of performance.

Moreover, indexing move from the queue emission to queue reception so from the executor to the indexer (TBD where it will be).

id: generate-plenty-logs
namespace: company.team

tasks:
  - id: python
    type: io.kestra.plugin.scripts.python.Script
    script: |
      for i  in range(10000):
        print("Iteration {}".format(i))