Add fetch Jira Issue or comments

### Feature description

Hi, I’m planning to use Kestra at my company.

I noticed there isn’t a feature to fetch Jira issues or comments yet.

Do you have any plans to add this feature?
If not, would it be okay if I try implementing it myself?

Start by reviewing the existing plugin-jira tasks for creating, updating, and searching Jira issues to understand the plugin's entry points and conventions. Define the supported fetching behavior for Jira issues and comments, then add coverage for the requested feature before verifying the plugin's existing task behavior.

Written by the indexing model from the issue text.