Fix build: Bundle schwab_scraper source and use local dependencies

schwab_scraper/core/errors.py

@@ -0,0 +1,30 @@
+class ScraperError(Exception):
+    """Base class for scraper-related errors."""
+
+
+class SessionExpiredError(ScraperError):
+    pass
+
+
+class LoginError(ScraperError):
+    pass
+
+
+class InvalidTickerError(ScraperError):
+    pass
+
+
+class NoDataError(ScraperError):
+    pass
+
+
+class DownloadError(ScraperError):
+    pass
+
+
+class PdfParseError(ScraperError):
+    pass
+
+
+class NavigationError(ScraperError):
+    pass