Respect Asset Compute Rendition Metadata provided by AEMaaCS

[stefanseifert]

• If an asset is uploaded within AEMaaCS, rendition metadata including width/height dimension is written to <rendition>/jcr:content/metadata. It's not guaranteed, it may be missing for asset not fully processed (e.g. imported via content package). And it's not present on local AEMaaCS SDK instances or AEM 6.5.
• But if it's present we should not generate it again in the Media Handler-specific path <asset>/renditionsMetadata/<rendition>, but read it directly from the resource provided by AEMaaCS

[sonarcloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
95.6% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud