Implement a function pdf word counter that extracts text from a PDF file using pdfminer.high level.extract…

Implement a function pdf word counter that extracts text from a PDF file using pdfminer.high level.extract…: a task in r2e-code-instruct-qwen3.5 (Harbor dataset). Input: PDF file path pointing to a valid PDF Output: {"hello": 2, "world": 1}