util: add hex colors support in `styleText` #4081

Job	Run time
Build slim tarball	2m 4s
x86_64-darwin: with shared libraries	33m 19s
aarch64-darwin: with shared libraries	18m 17s
aarch64-linux: with shared libraries	18m 9s
x86_64-linux: with shared libraries	21m 39s
	1h 33m 28s

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