fix(svg-generator): add kebab-case transform to type generator (#143)

[mokipedia]

PR Checklist

Please check if your PR fulfills the following requirements:

• [X] The commit message follows our guidelines: CONTRIBUTING.md#commit
• [X] Tests for the changes have been added (for bug fixes / features)
• [ ] Docs have been added / updated (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

[X] Bugfix
[ ] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[ ] Build related changes
[ ] CI related changes
[ ] Documentation content changes
[ ] Other... Please describe:

What is the current behavior?

icons with _ in name generate a missmatch between key and type, as keys are converted to kebab-case

Issue Number: #143

What is the new behavior?

as discussed in #143: types are now also generated as kebab-case

Does this PR introduce a breaking change?

[ ] Yes
[X] No

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[NetanelBasal]

@mokipedia tests are failing in CI

[mokipedia]

tests should be green now, my bad.