Feature: #108648 - Option to modify src attribute for Vimeo/YouTube 

See forge#108648

Description 

The new configuration option srcAttribute for the YouTubeRenderer and VimeoRenderer can be used to adjust the previously hard-coded src attribute in the generated iframe HTML code. This can be helpful if iframes shouldn't be loaded immediately because of privacy concerns, in which case an alternative such as data-src can be used in the initial HTML markup.

Example:

<f:media
    file="{youtubeVideo}"
    additionalConfig="{srcAttribute: 'data-src'}"
/>
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Impact 

The src attribute for YouTube and Vimeo embeds can now be renamed.