Change visibility of helper functions (Resources)

[angelix]

Change visibility of the following extension functions.

internal expect fun ByteArray.toImageBitmap(): ImageBitmap
internal expect fun ByteArray.toXmlElement(): Element
internal expect fun ByteArray.toSvgElement(): SvgElement

Those are very useful especially for native targets.

[terrakok]

It is not responsibility of the resources library. We will do that in the compose core.

[okushnikov]

Please check the following ticket on YouTrack for follow-ups to this issue. GitHub issues will be closed in the coming weeks.