fix: ASCII animation was not working properly in the image builder logs

[yetone]

What does this PR address?

👈 BentoML CLI 🆚 kubectl 👉

ascii-animation-4k.mp4

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[frostming]

The interfaces of Spinner don't look good, will refactor later.

[aarnphm]

few tiny things, with the types we can upgrade to newer syntax as a whole in a later PR.