Add new node Foreach

[sohelzerdoumi]

Self Checks

• [X] I have searched for existing issues search for existing issues, including closed ones.
• [X] I confirm that I am using English to submit this report (我已阅读并同意 Language Policy).
• [X] Pleas do not modify this template :) and fill in all the required fields.

1. Is this request related to a challenge you're experiencing?

Given a long input text, I would like to handle the blocks independently, then merge the results.

For exemple, summerize very long text

2. Describe the feature you'd like to see

I would like 2 nodes:

• Foreach node: based on array input, it will handle next flow independently
• Merge node: based on previous flow, it will end Foreach, then assign all outputs to single array variable

3. How will this feature improve your workflow or experience?

This can solve my challenge

4. Additional context or comments

No response

5. Can you help us with this feature?

• [ ] I am interested in contributing to this feature.