Add parser branch--for Enhancing parsing speed

[Da1wn]

For enhancing parsing speed with multicore

We have introduced a multi-layer finite state machine,

which serves as the basis for enhancing the speed of parallel processing of CSV files on single-machine multicore systems.

SIMD instruction sets are used to obtain the bitmap as quickly as possible.

The main modifications are in file src/import/RecordSet.h, RecordLoader.h, RecordLoader.cpp, CSVPathParser.h and CSVPathParser.cpp.

[CLAassistant]

All committers have signed the CLA.

[CLAassistant]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you sign our Contributor License Agreement before we can accept your contribution.
_{You have signed the CLA already but the status is still pending? Let us recheck it.}