implement Jira integration (projects, issues import, task API)
- Implemented Jira integration for fetching projects and issues from Atlassian API and importing them into MindTrace (ReferenceProject + Task)
- Added Jira APIs for projects retrieval, import and issue import (/jira/integrations/{integrationUuid}/projects, /jira/imported-projects, /jira/issues/import)
- Added Task APIs for project-based retrieval and search (/tasks/project/{projectId}, /tasks/search)
- Added Jira and Task services including JiraProjectService, JiraIssueService, JiraIssueImportService and TaskService
- Added DTOs for Jira projects, Jira issues import and Task management (JiraProject, JiraIssue, Task DTOs)