Can't create multiple tasks at once with Todoist

[danoc]

Describe the bug
Hello! There's an issue in the Todoist integration that causes it to create multiple copies of the same task when it receives multiple items.

I believe the problem is related to a recent refactor. Notice how CreateHandler's handleOperation function expects an itemNumber (first link) and that the itemNumber is hardcoded as 0 (second link):

https://github.com/n8n-io/n8n/pull/3074/files#diff-7569657bb643f975e22272d9c9b11a255a0ce409845a59a2e0605f55c5b59354R10-R12

https://github.com/n8n-io/n8n/pull/3074/files#diff-10b0852fb2ddcadcdfd9bc00e6718fa0e8eea340f32fba38cf8e0a404551e1adR18-R20

To Reproduce
Steps to reproduce the behavior:

1. Pass in a list of X items to the Todoist Task Create operation.
2. Notice that X items get created, but they all share the same title despite using an expression.
3. Switch Todoist for another integration like "Send Email" and notice that it works as expected and each email has unique content.

Expected behavior
X number of items get created with unique details

Environment (please complete the following information):

• OS: Official Docker image
• n8n Version: 0.183.0
• Node.js Version Unknown
• Database system: SQLite
• Operation mode: own

Additional context
N/A

[danoc]

cc: @agobrech and @RicardoE105 who recently worked on the integration: #3074

[Joffcom]

Hey @danoc,

Good spot, I have just popped in a PR to fix this.

[janober]

Thanks a lot. Fix got merged.