feat: optimize SVGs during build

[mojoaxel]

Summary

I want to import icons as svg files and I realized that they are not optimized. e.g

• lots of unnecessary decimal places
• use of transforms/translates
• unnecessary tags

I introduced svgo as a gulp step to optimize the svg files early.

this reduces the size of the dist assets:

• svg/: 963,1 --> 399,7 kB

How did you test this change?

• 👀 It looks like no icons where harmed during this PR
• 🤖 I tries to use yarn test to test for regressions but it looks like these fail also in main.
  See broken regression tests #29

[danielleroux]

@mojoaxel yes, we plan a major refactoring with the next major release of @siemens/ix. We need some time to get your work synced wth our current working state.

[nuke-ellington]

@mojoaxel could you please bring your branch up to date with main so we can have a final review? Thanks!

[mojoaxel]

@nuke-ellington I've rebeased on the current main and removed the icon-font support in my branch.

Now it's a very minimal change, just introducing svgo to the build pipeline, which reduces the svg folder-size by ~60%.