chore(codecs): Use simdutf for converting bytes to string

[JakubOnderka]

Summary

Speed up decoding json, elasticsearch sink and journald source by using simdutf8 crate for faster checking if string is UTF-8 valid by utilizing SIMD instructions. simdutf8 is already used in vrl, so I just reuse method that internally uses VRL.

According to crate docs this library is:

x86-64: Up to 23 times faster than the std library on valid non-ASCII, up to four times faster on ASCII
aarch64: Up to eleven times faster than the std library on valid non-ASCII, up to four times faster on ASCII (Apple Silicon)

How did you test this PR?

Standard vector tests

Change Type

• Bug fix
• New feature
• Dependencies
• Non-functional (chore, refactoring, docs)
• Performance

Is this a breaking change?

• Yes
• No

Does this PR include user facing changes?

Just performance improvement.

• Yes. Please add a changelog fragment based on our guidelines.
• No. A maintainer will apply the no-changelog label to this PR.