Add support for Vue 3 and JSX

[Kocal]

While scrolling the source code, I've just seen:

        // useJsx and vue 3 are not currently supported by Encore
        if (this.vueOptions.useJsx && this.vueOptions.version === 3) {
            throw new Error('Setting both "useJsx: true" and "version: 3" for enableVueLoader() is not currently supported. Please use version: 2 or disable useJsx.');
        }

Since we plan to deprecate and remove Vue 2 support (#1276), it means users won't be able to use JSX anymore if we don't add JSX support with Vue 3.