Allowing to add properties for integration with other CMS

Feature Description

While trying to integrate core story-editor with other CMS I found that it is not necessary that every CMS will provide a MediaModal like WordPress does, there may be instances where we might need to pass down some props via CMS-story-editor which will allow invoking MediaModal of that CMS. Some places that might need this: https://github.com/google/web-stories-wp/blob/91d7271af6a7f17b42e0be4bbaef5332fecd7170/packages/story-editor/src/app/highlights/quickActions/useQuickActions.js#L187-L198 https://github.com/google/web-stories-wp/blob/76f20d3303a44ef5a4092dde4971acf55b2b7f77/packages/story-editor/src/components/form/media.js#L101-L127 https://github.com/google/web-stories-wp/blob/25d43b402e39f46de36ec4636a1893f8749b932e/packages/story-editor/src/components/library/panes/media/local/mediaPane.js#L297-L310 https://github.com/google/web-stories-wp/blob/25d43b402e39f46de36ec4636a1893f8749b932e/packages/story-editor/src/components/library/panes/media/local/mediaPane.js#L312-L324 https://github.com/google/web-stories-wp/blob/76f20d3303a44ef5a4092dde4971acf55b2b7f77/packages/story-editor/src/components/panels/design/captions/captions.js#L153-L172 https://github.com/google/web-stories-wp/blob/c210a3c9307a224ed800551c04df93e3b066a0ac/packages/story-editor/src/components/panels/shared/backgroundAudioPanelContent.js#L82-L94

Alternatives Considered

Additional Context

[amovar18]

@swissspidy Due to some issue, bootstrap.Modal wasn’t showing before when I checked, but now I see that it’s globally available to use. So I was able to open the modal using bootstrap.Modal. So extra attributes aren’t required.

[swissspidy]

I’m still not sure how good of an idea it is to allow injecting random attributes to support this use case 🤔 But seems like it’s the most viable option.

@sayedtaqui @choumx any thoughts on this?