Initial import of libdpf.

Co-authored-by: Cursor <cursoragent@cursor.com>

CPPLINT.cfg

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+# Don't search for additional CPPLINT.cfg in parent directories.
+set noparent
+
+# include project root in path construction (for header guards) 
+root=..
+
+# { should almost always be on a new line
+filter=-whitespace/braces
+
+# Scope specifiers are indent +2 spaces
+filter=-whitespace/indent
+
+# An else should appear on the same line as the preceding }
+filter=-whitespace/newline