refactor: propagate compact size when ui5-content-density-compact class is set

[MapTo0]

No description provided.

[ilhan007]

Great effort!

One comment:
The size params should be declared 3 times:
:root {default/cozy} - in place
.compact{} - in place
.cozy {} - this is one is missing (when someone configures compact, but want part in cozy)

[MapTo0]

BREAKING CHANGE: set/get for compact size is removed, use CSS class ui5-content-density-compact as a replacement.

[ilhan007]

Update the commit message a little bit (use the public class name ui5-...),
and maybe describe the new stuff in section "Content Density" like "Theme" and the rest in the Configuration.md:

• add few words about Content Density (that it defines the sizes, paddings, margins of components)
• mention that by default all components are "Cozy"
• how to set "Compact" and that in Compact the mertics are smaller/ decreased.

[MapTo0]

• add a global classes ui5-content-density-compact, sapUiSizeCompact(private) which redefine all COSY variables with COMPACT values
• adopt all components
• remove compact setting from Configuration
• update documentation for compact / cosy setting
• remove content density related modules

BREAKING CHANGE: set/get for compact size is removed, use CSS class ui5-content-density-compact as a replacement.