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 modify the previously hard-coded src attribute in the resulting iframe HTML code. This can be useful if the iframe should not be immediately loaded because of privacy concerns. 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.