feat: change iconName to icon

[seanes]

Before:

npm notice name: @altinn/altinn-components
npm notice version: 0.15.5
npm notice filename: altinn-altinn-components-0.15.5.tgz
npm notice package size: 163.1 kB
npm notice unpacked size: 1.3 MB
npm notice shasum: 74120c478a305630ef81f45dff1e5d434bfa5f74
npm notice integrity: sha512-C0GFI2fNx+ZQq[...]pUIJxDJbtAmSA==
npm notice total files: 813

Before:

npm notice name: @altinn/altinn-components
npm notice version: 0.15.4
npm notice filename: altinn-altinn-components-0.15.4.tgz
npm notice package size: 289.1 kB
npm notice unpacked size: 2.6 MB
npm notice shasum: 0c70e75717acca21582535858b806b32dc72676f
npm notice integrity: sha512-fhlBMSive10x0[...]Rnas3bpuPSBiA==
npm notice total files: 800

Description

Related Issue(s)

• Bundle large because of iconsMap #187

Verification

• Your code builds clean without any errors or warnings
• Manual testing done (required)
• Relevant automated test added (if you find this hard, leave it and we'll help out)
• All tests run green

Documentation

• User documentation is updated with a separate linked PR in altinn-studio-docs. (if applicable)

[allinox]

I admit this isn't my most thorough QA, but what I've seen from the code and testing in storybook looks good to me 😊
Great work! 🙌

[allinox]

Nitpicky, but this documentation on how to use the component should probably be updated to using the new icon system