Speed up Parquet utf8 validation

[Dandandan]

Is your feature request related to a problem or challenge? Please describe what you are trying to do.
Utf8 validation comes up in profiles when reading Parquet.

Describe the solution you'd like

We could use https://docs.rs/simdutf8/latest/simdutf8/ to speed up validation of utf8.

Describe alternatives you've considered

Additional context

[alamb]

Here is another idea: #6701