Added script with multiple approaches to get pdf title name

[qiu-tiandev]

Added get_pdf_title.py to try to get the pdf title from the following order:

1. title metadata
2. first line in the first 2 pages if less than 30% of its content being numbers (prevent dates)
3. First readable line in the first 2 pages
4. First readable line in the entire doc
5. Unititled_SHA1HASH
   From issue Generate Better PDF Titles #32
   @kylebd99

[kylebd99]

Hey! Sorry for the slow response on this, and thank you for working on it!

This looks like a great start for getting better titles, but I'd like to move it around a bit in the code base. In particular, could you generate the pdf title in the function create_metadata_jsons_worker in pdf_to_embed.py? That way it will run when we create the metadata information, and we can store the title within the metadata index. Also, it would be great if you could include a couple of basic tests for the function. For example, create a couple of simple PDFs that demonstrate each of the title inference paths, then make a test file that performs that inference.

Thanks again for the help!

[qiu-tiandev]

Hi,
I will work on it ASAP. Thank you!