[Feature] improve CsvLoader & clean code

[JJK801]

Hi Flowise,

Here is a PR which aims to improve CSV Data loading, th key points are:

• Improve CSV Handling by using a custom loader with Papaparse (auto detect separator, auto detect headers, streaming capability, direct local file load capabilities, remote file load capability, ...) which is more memory friendly and efficient
• Clean some code (create methods to make code more readable, extract some utils functions, ...)
• Cleanup S3 Loaders (File & Directory) & use custom CSVLoader in it.

This also opens some opportunities:

• Improve memory management by directly loading CSV Files into the parser
• Stream responses instead of getting fat raw data
• Load CSV files from a remote URL

[HenryHengZJ]

thanks @JJK801, tested and works like a charm!

I've added ability to use built in loaders for S3 File

[HenryHengZJ]

can you pull the latest changes and update the pnpm lock file?

[JJK801]

@HenryHengZJ done

[HenryHengZJ]

Note: we can use the refractor util function for every other doc loaders in future