feat: add readUtf8 and writeUtf8

[targos]

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[codecov-io]

Current coverage is 100% (diff: 100%)

Merging #32 into master will not change coverage

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[targos]

@windwp is that what you need?

[targos]

@stropitek @maasencioh what do you think?

[maasencioh]

LGTM if you already test the utf8 library

[stropitek]

LGTM
Maybe it would make sense to also implement a readUtf8Char that is smart about the number of byte it reads. I think utf-8 makes it very easy to know how many bytes to read by reading the first byte.

[targos]

Thanks. Merged and released in v3.2.0

[targos]

Maybe it would make sense to also implement a readUtf8Char that is smart about the number of byte it reads.

Yeah, I don't know of a library that can do that. We should do it only if we know about a format that specifies the number of characters to read instead of the number of bytes.