Implement compressed stub for sketch upload

[devyte]

Basic Infos

• This issue complies with the issue POLICY doc.
• I have read the documentation at readthedocs and the issue is not addressed there.
• I have tested that the issue is present in current master branch (aka latest git).
• I have searched the issue tracker for a similar issue.
• If there is a stack dump, I have decoded it.
• I have filled out all fields below.

Platform

• Hardware: all
• Core Version: latest git
• Development Env: Arduino IDE
• Operating System: all

Settings in IDE

• Module: all
• Flash Mode: all
• Flash Size: all
• lwip Variant: all
• Reset Method: all
• Flash Frequency: all
• CPU Frequency: all
• Upload Using: SERIAL (OTA?)
• Upload Speed: N/A

Problem Description

Implement compressed stub for flashing a sketch, like on ESP32. This would decrease flashing time (or rather increase throughput).
Of particular note, this could be useful for flashing SPIFFS image.

Ref: #4973 and first reply.