Add 'small' variation to chart series labels
At the moment, chart series labels are one size only.
As in some scenarios there is the need for smaller labels, we should provide a prop for setting said size.
- Implement prop to change size with smaller one
- Update story in storybook to showcase the usage of the new prop
- Replace style overrides with the new prop wherever they were used (e.g. tabular chart legends)
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