feat: adding multiple list items to be added with one function call

[aevo98765]

Add a description of the changes (frequently the same as the commit description)
Changing the original add list ietm function to support many list items. This reduces the amount of tool calls an agent has to do. One list can be curated in one call.

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#10

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Codecov Report

Attention: Patch coverage is 62.50000% with 3 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
docling_mcp/tools/generation.py	62.50%	3 Missing ⚠️

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