fix: [CO-1377] enabled pdf preview on external window

[mbarto]

This PR adds a couple of configuration property to the PdfPreview, that used together enable the preview to work fine when the preview is shown on a different tab / window than the one running the code (e.g. email open on a distinct tab).

The issues we want to solve:

• rendering of pdf pages stop when the main carbonio tab is in the background, and this is happening when the preview is invoked from a msg displayer in a separate tab
• fonts are not properly loaded, because they are loaded in the main carbonio tab, but used by the other tab

The new properties are:

• target: 'display' or 'print'; print mode uses the same name intent of react-pdf for page rendering (display is the default); this avoids rendering to stop when the main carbonio tab is in the background; to use the intent a custom version of the react-pdf Canvas renderer has been used
• options: allows setting custom options for the react-pdf Document component (will be used to set a different ownerDocument), so that fonts are loaded in the tab where the preview is shown

[CLAassistant]

All committers have signed the CLA.

[sonarqube-zextras]

Quality Gate failed

• 7.70% Coverage on New Code (is less than 80.00%)

Project ID: carbonio-ui-preview

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