[Figma] Lead space block

[RichKummer]

v2 design specs

Updates to the component in v2:

• [x] Removed title and subheading discrepancy. Now there is only one heading for the component.
• [x] New highlight span can be added to the heading (no where else). Highlight can apply to a word or words anywhere in the heading.
• [x] New Dotcom color token to handle highlight across lead space components: $heading-highlight.
• [x] Updated spacing values to bring in line with content block/section. Margin at top and bottom.
• [x] No more 90% container width for text. Text width is now more in-line with content block (instead of 90% of container)
• [x] For @max through @md, the border option now overhangs into the gutter (see content block)