Support use of embedded SVG Fonts (like though created by Batik Graphics2D SVG Generator)
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#### Steps to reproduce:
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- open the file with Inkscape and with the browser (e.g. Microsoft Edge)
#### What happened?
- the browser showed correct glyphs and layouts, but Inkscape did not
#### What should have happened?
- Inkscape should have shown glyphs exactly the same as the browser did
#### Inkscape Version and Operating System:
Inkscape 1.1 (inkscape@c68e22c38707cfe8a4d9402082e4faec8bcd15dc, 2021-05-23)
GLib version: 2.68.2
GTK version: 3.24.29
glibmm version: 2.66.0
gtkmm version: 3.24.3
libxml2 version: 2.9.12
libxslt version: 1.1.34
Cairo version: 1.17.4
Pango version: 1.48.5
HarfBuzz version: 2.8.1
Poppler version: 20.12.1
OS version: Windows 10 2009
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In the browser you should be able to see the correct render:

But when open with Inkscape:

issue