feat(sdk): expose color and typography options for smart scalar in embedding SDK (#42915)

* feat(sdk): allow overriding positive and negative values

* docs(sdk): add positive and negative colors to docs

* feat(sdk): add smart scalar font size

* feat(sdk): add smart scalar line height settings

* feat(sdk): get rid of custom embedding mantine theme type

* wip: setup storybook and loki for smart scalar

* fix missing state for rendering visualizations

* docs(sdk): add scalar customizations to readme

* test(sdk): add test cases to loki

* add smart scalar reference image

* use css variables for brand

* make embedding theme options partial

* fix scalar value wrapper line height

* update loki snapshot

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Co-authored-by: Aleksandr Lesnenko <alxnddr@gmail.com>