Add EUVD importer

[nscuro]

Closes #37

[Copilot]

Pull Request Overview

This PR adds support for importing vulnerabilities from the European Union Vulnerability Database (EUVD). Key changes include the addition of a new importer and related classes for deserialization and vulnerability records, updates to the persistence of vulnerability data, and minor workflow adjustments and dependency additions.

• Added the EUVD importer and supporting data model classes.
• Integrated resilience4j retry support for handling network errors.
• Updated configuration files and GitHub workflows to include EUVD as a source.

Reviewed Changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
src/main/resources/META-INF/services/org.dependencytrack.vulndb.api.Importer	Registers the new EUVD importer.
src/main/java/org/dependencytrack/vulndb/source/euvd/NewlineDelimitedListDeserializer.java	Provides a deserializer for newline-delimited lists.
src/main/java/org/dependencytrack/vulndb/source/euvd/EuvdVulnerability.java	Defines the vulnerability record with format annotations (note the TODO comments in timezone configuration).
src/main/java/org/dependencytrack/vulndb/source/euvd/EuvdVulnerabilitiesPage.java	Adds a new record type to represent a page of vulnerabilities.
src/main/java/org/dependencytrack/vulndb/source/euvd/EuvdImporter.java	Implements the importer logic for EUVD, including HTTP retries and JSON parsing.
pom.xml	Adds the resilience4j-retry dependency.
.github/workflows/update-database.yml	Updates the workflow to include the EUVD source for database updates.