feat: add PptxNodeToolkit with PptxGenJS support

[aviralgarg05]

Description

This pull request introduces the PptxNodeToolkit, a new toolkit designed to generate PowerPoint (.pptx) presentations by leveraging the PptxGenJS Node.js library.

While CAMEL already provides a native PPTXToolkit based on python-pptx, this new toolkit offers a "hybrid" alternative for users who require the specific layout capabilities, template support, or ease of use provided by the PptxGenJS ecosystem.

Key Changes:

1. PptxNodeToolkit: A Python wrapper that manages the execution of a Node.js bridge.
2. generate_pptx.js: A Node.js script located in camel/toolkits/scripts/ that handles the actual presentation creation, slide formatting (titles, headings, bullets), and table rendering.
3. Seamless Integration: Serializes toolkit content to JSON and communicates with the Node.js process via subprocess, returning status messages to the agent.

Note: Users will need node and pptxgenjs installed in their environment to utilize this specific toolkit.

Checklist

Go over all the following points, and put an x in all the boxes that apply.

• I have read the CONTRIBUTION guide (required)
• I have linked this PR to an issue using the Development section on the right sidebar or by adding Fixes #915 in the PR description (required)
• I have checked if any dependencies need to be added or updated in pyproject.toml and uv lock (Node.js dependency is external)
• I have updated the tests accordingly (required for a bug fix or a new feature)
• I have updated the documentation if needed
• I have added examples if this is a new feature

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[lightaime]

Thanks @aviralgarg05. Great work. Left some minor comments

[JINO-ROHIT]

thanks @aviralgarg05 can you add/update the example file to show the new changes/differences, would be also nice to add in the comments the pre-reqs for using this toolkit, ie node etc

[bytecii]

Left some comments. Thanks!

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