Add TextVIew and StyledTextView

[dacec354]

TextView is a read-only text component, effectively an uneditable TextArea. It renders plain UTF-8 text with a uniform text style, and supports scrolling, wrapping, and viewport sizing.

StyledTextView is the styled-text variant of TextView. Instead of applying one text style to the whole content, it renders text that already contains ANSI SGR styling. It should preserve style correctly under scrolling, wrapping, and viewport rendering, including continuing active styles across soft-wrapped lines without leaking into adjacent content.

[dacec354]

my goal is the same as #47 .
what do you think which is more feasible? Or there is another approach.