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[FEATURE] Minifier: Support input source maps (#780)

If a resource references a source map (for example from an earlier transpilation):
1. Use that source map for the debug variant of the resource
2. Pass it to terser so it can update it based on the transformation, preserving the mapping to the initial source

Before this change, the minifier processor always created a new source map based on the minification of the resource. This change is active by default. However, if a resource is changed before the `minify` task is executed (for example by tasks like `replaceCopyright`), we assume that the referenced source map is potentially corrupt and therefore ignore it.

JIRA: CPOUI5FOUNDATION-467

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Co-authored-by: Matthias Osswald <mat.osswald@sap.com>
Co-authored-by: Günter Klatt <57760635+KlattG@users.noreply.github.com>

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