Advertise a pushed ScanCode scan in the FederatedCode ActivityPub server

[keshav-space]

A typical note for scan advertisement looks like:

purl: 'pkg:alpine/advancecomp@2.1-r2'
scans:
  - tool: 'pkg:pypi/scancode-toolkit'
    file_name: scancodeio.json
  - tool: 'pkg:type/namespace/name'
    file_name: tool_scan.json

[keshav-space]

Completed in: #44

The simple way to test this is to follow the below steps after installing FederatedCode (https://github.com/aboutcode-org/federatedcode?tab=readme-ov-file#quick-installation):

1. Create superuser python manage.py createsuperuser
2. Login to federatedcode admin panel http://127.0.0.1:8000/admin/
3. Go to http://127.0.0.1:8000/admin/fedcode/service/add/ and create service slect newly created superuser as user, and leave remote-actor empty.
4. Go to go to http://127.0.0.1:8000/create-repo and add https://github.com/aboutcode-org/aboutcode-packages-npm-385
5. Run python3 manage.py sync sync_scancode_scans to sync scan
6. Install federatedcode client using pip install aboutcode.federatedcode
7. Go to http://127.0.0.1:8000/purls/@pkg:npm/atlasboard/ to get the scan advertisement for pkg:npm/atlasboard