Our string builder class has a simple fast_needs_escaping function for 64-bit ARM and x64 processors.

https://github.com/simdjson/simdjson/blob/e362b18499ef29543b828610777de8333f4ca53e/include/simdjson/generic/builder/json_string_builder-inl.h#L84C22-L84C41

We should add support for loongarch processors.