Do not autoload plugin option

[aristath]

Context

This PR changes ensures the plugin option is not autoloaded, to improve performance.

[github-actions]

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[ilicfilip]

@aristath , this PR will set autoload to false for new installs and it will update the auto load value when existing users update the option?

Should we add an upgrade script to do it automatically when plugin is updated?
I was thinking something light, like we do it is done in Comment Experience

[aristath]

@aristath , this PR will set autoload to false for new installs and it will update the auto load value when existing users update the option?

Yes, that is correct.

Should we add an upgrade script to do it automatically when plugin is updated?

I don't think that's necessary... The option gets updated in Plugin::update_tracked_options(), which is hooked in shutdown (in Plugin::register_hooks()), so it will be auto-updated after the 1st page-load anyway