QRegularExpression: add support for saving & loading precompiled patterns

Hello.

I have a software that needs to check against huge (700 000+) number of QRegularExpression patterns and the loading and having to optimizing them with QRegularExpression::optimize() takes ages, even with fast computer.

Could there be function like QRegularExpression::savePattern() / loadPattern() that I could use to save / load compiled patterns to/from disk and make the loading of patterns faster?

According to PCRE docs saving (non-jit) compiled patterns should be possible

https://www.pcre.org/original/doc/html/pcreprecompile.html