Add sync engine to import licenses and obligations from LicenseDB

[Sandipmandal25]

Summary

Adds the LicenseDB sync engine as the second part of the SW360 and LicenseDB integration.

This builds on the HTTP client added in #4268 and adds the complete flow for fetching licenses and obligations from LicenseDB and storing them in SW360.

Changes

• added importAllLicenseDBLicenses() in LicenseDatabaseHandler
• reads the LicenseDB URL, credentials, and enabled flag from LICENSEDB_REST
• fetches active obligations from /api/v1/obligations/export
• fetches active licenses from /api/v1/licenses/export
• imports obligations first because licenses reference them by UUID
• matches existing data using externalIds["licensedb-id"]
• falls back to shortname matching during the first sync
• preserves SW360 specific fields like checked, FSFLibre, whitelist, and manually added obligations
• stores the last successful sync time in the licensedb-sync-state CouchDB document
• added LicenseDBDataMapper to map LicenseDB DTOs to SW360 Thrift objects
• maps obligation types like RISK, RESTRICTION, RIGHT, and OBLIGATION

Endpoint

• added ADMIN only endpoint POST /api/licenses/import/LicenseDB

Suggested reviewers

• @GMishx
• @deo002
• @Farooq-Fateh-Aftab

[GMishx]

Minor code refactoring suggestions. Rest looks good.