Quick summary

The options for sizes of the icons are inconsistent with options available in other blocks in WordPress currently, such as the Paragraph block, for example:

You are presented with preset sizes, which may not work for the intended design of a site:

Steps to reproduce

1. Add a social icons block
2. Change the size of the icons.

What you expected to happen

More granular size options, i.e. pixels, ems, etc.

What actually happened

Only preset sizes available. It would be great to make the experience with this core block matching to what's available with other core ones.