Improve compaction of empty/blank TextComponents

[Moulberry]

Improve compaction of empty/blank TextComponents

I believe that for a TextComponent comprised of only space characters (" "), TextColor and ITALIC stylings are redundant.
We can take advantage of this in order to further compact components.

Font and BOLD stylings also seem like candidates for removal, but afaik BOLD affects the advance of space character and in 1.19 Font will do so too.

Some examples

Removal of useless styling on blank components

Input: {"text":" ","color":"red"}
Before: {"text":" ","color":"red"}
After: {"text":" "}

Compaction of blank components (side effect of previous)

Input: {"text":"Hello ","extra":[{"color":"red","text":" "}]}
Before: {"text":"Hello ","extra":[{"color":"red","text":" "}]}
After: {"text":"Hello "}

#Removal of empty children, regardless of style

Input: {"text":"Hello ","color":"red","extra":[{"strikethrough":true,"text":""}]}
Before: {"text":"Hello ","color":"red","extra":[{"strikethrough":true,"text":""}]}
After: {"text":"Hello ","color":"red"}

[zml2008]

Could you add some tests for this as well?

rebase needed as well, but that can happen with other changes

[Moulberry]

Last commit was supposed to say: Use optimized instead of self
It also fixed checkstyle errors