Schema for Responsive image (Lazy-load) formatter is missing [#3519642]

Problem/Motivation

Schema for Responsive image (Lazy-load) formatter is missing.

Steps to reproduce

Install Lazy, Responsive image and Config inspector modules.
Setup Responsive image (Lazy-load) formatter.
Check config inspector module.
You can see missing schema issue for your field formatter.

Proposed resolution

Add schema.

Remaining tasks

User interface changes

API changes

Data model changes

Issue fork lazy-3519642

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3519642-schema-for-responsive changes, plain diff MR !23
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