community: support advanced text extraction options for pdf documents (#20265)

**Description:** 
- Updated constructors in PyPDFParser and PyPDFLoader to handle
`extraction_mode` and additional kwargs, aligning with the capabilities
of `PageObject.extract_text()` from pypdf.

- Added `test_pypdf_loader_with_layout` along with a corresponding
example text file to validate layout extraction from PDFs.

**Issue:** fixes #19735 

**Dependencies:** This change requires updating the pypdf dependency
from version 3.4.0 to at least 4.0.0.

Additional changes include the addition of a new test
test_pypdf_loader_with_layout and an example text file to ensure the
functionality of layout extraction from PDFs aligns with the new
capabilities.

---------

Co-authored-by: Bagatur <22008038+baskaryan@users.noreply.github.com>
Co-authored-by: Bagatur <baskaryan@gmail.com>
Co-authored-by: Erick Friis <erick@langchain.dev>

libs/community/langchain_community/document_loaders/pdf.py

@@ -171,6 +171,9 @@ class PyPDFLoader(BasePDFLoader):
         password: Optional[Union[str, bytes]] = None,
         headers: Optional[Dict] = None,
         extract_images: bool = False,
+        *,
+        extraction_mode: str = "plain",
+        extraction_kwargs: Optional[Dict] = None,
     ) -> None:
         """Initialize with a file path."""
         try:
@@ -180,7 +183,12 @@ class PyPDFLoader(BasePDFLoader):
                 "pypdf package not found, please install it with " "`pip install pypdf`"
             )
         super().__init__(file_path, headers=headers)
-        self.parser = PyPDFParser(password=password, extract_images=extract_images)
+        self.parser = PyPDFParser(
+            password=password,
+            extract_images=extract_images,
+            extraction_mode=extraction_mode,
+            extraction_kwargs=extraction_kwargs,
+        )
 
     def lazy_load(
         self,