Bulk create issues

[vidarhr]

What would you like to be added?

The feature to bulk create issues

Why is this needed?

For adding multiple issues in a single call instead of having multiple calls for multiple issues.

Anything else we need to know?

This is described in the Jira rest API at:
https://developer.atlassian.com/cloud/jira/platform/rest/v3/api-group-issues/#api-rest-api-3-issue-bulk-post