Enhance layout behavior of `body` to adapt to different writing modes

[czerkies]

• @container query on ICB
• Change font-size property on inline-size
• Add font-size custom properties to be used as private custom properties in the body element
• Logical Properties by default
• Detect orientation with :dir(*) selector

[czerkies]

Safari doesn't affect container queries on html element when zoom increase or decreased.

• Comment added on WebKit : https://bugs.webkit.org/show_bug.cgi?id=249992#c6
• First wrong behaviour already filled : CSS Containment Module Level 3 #32 (comment)