Add API key validation, enhance /up client methods

- Implemented UUID format validation for API keys.
- Enhanced the `/up` client methods to accept additional headers,
  query parameters, and timeouts.
- Raised `PdfRestAuthenticationError` for authentication failures.
- Refactored request composition for improved reuse and readability.
- Updated tests to cover new validations and functionalities.

Author: datalogics-kam

src/pdfrest/__init__.py

@@ -2,9 +2,10 @@
 
 from importlib import metadata
 
-from .client import AsyncPdfRestClient, PdfRestClient, RequestOptions, UpRequestOptions
+from .client import AsyncPdfRestClient, PdfRestClient
 from .exceptions import (
     PdfRestApiError,
+    PdfRestAuthenticationError,
     PdfRestConfigurationError,
     PdfRestError,
     PdfRestRequestError,
@@ -17,14 +18,13 @@
 __all__ = (
     "AsyncPdfRestClient",
     "PdfRestApiError",
+    "PdfRestAuthenticationError",
     "PdfRestClient",
     "PdfRestConfigurationError",
     "PdfRestError",
     "PdfRestRequestError",
     "PdfRestTimeoutError",
     "PdfRestTransportError",
-    "RequestOptions",
-    "UpRequestOptions",
     "UpResponse",
     "__version__",
     "translate_httpx_error",