SwaggerEditor@next: readonly mode set via prop override

[Vladimír Gorej]

Readonly mode is managed via a redux state. But, it's also possible to pull an Editor component out from the system and pass it isReadOnly prop explicitly.

  const Editor = getComponent('Editor', true);

  <Editor isReadOnly />
  <Editor />

If passing the explicit isReadOnly prop is used, the prop is ignored and the redux state is always preferred.

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The goal of this issue is to always prefer theisReadOnly prop if passed explicitly + overriding the redux state with the vlaue of the prop.

[Vladimír Gorej]

Addressed in #4977