feat(typography): add fontFamily, letterSpacing, and textTransform props

[rinkydevi]

Closes #328

Summary

Adds three new styling props to the Typography component so consumers can control font family, letter spacing, and text transformation directly via props, without needing to override via CSS.

Prop	Type	Default
fontFamily	string	inherit
letterSpacing	string | number	normal (number is treated as px)
textTransform	'none' | 'capitalize' | 'uppercase' | 'lowercase'	none

Each prop sets a CSS custom property (--typography-font-family, --typography-letter-spacing, --typography-text-transform) that the component's stylesheet already consumes, keeping the pattern consistent with existing token-based styling.

Changes

• typography.tsx — destructure and apply the three new props as inline CSS custom properties; refactored truncateStyle into a unified customStyle object
• typography.module.css — add letter-spacing and text-transform declarations backed by the new custom properties
• index.ts — export TypographyTextTransform type; update CSS token table with the two new tokens
• typography.test.tsx — 9 new unit tests covering string, number, and omitted cases for all three props
• typography.stories.tsx — new TextStyleProps story demonstrating each prop individually and in combination

##Evidence

Test plan

• All 36 typography unit tests pass
• Zero TypeScript errors (tsc --noEmit)
• TextStyleProps Storybook story shows fontFamily, letterSpacing, and textTransform rendering correctly, including a combined usage example

[H4ad]

Some little changes, sorry for not detailing it first on the ticket

[H4ad]

Would you mind changing this to be an enum with predefined values?

I was planning to use the naming/values from: https://github.com/SigNoz/design-tokens/blob/main/src/style.css#L405-L413

[H4ad]

This one we can do similar to letterSpacing, use a enum/type to describe only inter and monospaced, default is inter, both from https://github.com/SigNoz/design-tokens/blob/main/src/style.css#L372-L373