offload_daemon: Introduce a reference implementation

Adding a new dedicated binary that is meant to be used as a reference
implementation for validating that offloaded snapshot/restore works and
meant to be used through tests in general.

Signed-off-by: Sebastien Boeuf <sboeuf@meta.com>
Assisted-by: Claude:claude-opus-4-7

scripts/gitlint/rules/TitleStartsWithComponent.py

@@ -47,6 +47,7 @@ class TitleStartsWithComponent(LineRule):
             'main',
             'misc',
             'net_util',
+            'offload_daemon',
             'openapi',
             'option_parser',
             'pci',