Configuration:
- PDF.js version: 2.0.550

Steps to reproduce the problem:
1. Render document in SVG mode `renderMode="svg"`

What is the expected behavior? (add screenshot)
Rendering annotations same way as they rendered on canvas

What went wrong? (add screenshot)
```
Warning: Unimplemented operator beginAnnotations
Warning: Unimplemented operator endAnnotations
```
const italicAngle = -descriptor.get("ItalicAngle");
      const cssFontInfo = { fontFamily, fontWeight, italicAngle };
      if (!validateCSSFont(cssFontInfo)) {
        continue;
      }
      promises.push(
        partialEvaluator
          .handleSetFont(
            resources,
            [Name.get(fontName), 1],
             null,
            operatorList,
            task,
            initialState,
             null,
             cssFontInfo
          )
          .catch(function (reason) {
            warn(`loadXfaFonts: "${reason}".`);
            return null;
          })
      );
    }
    await Promise.all(promises);
    const missingFonts = this.xfaFactory.setFonts(pdfFonts);
    if (!missingFonts) {
      return;
    }