feat: add decimal_to_binary tool

[Ayush-0918]

Summary

This PR adds a new decimal_to_binary tool that converts a decimal integer into its binary string representation.

What Changed

• Added a new tool: tools/decimal_to_binary.py
• Implemented the required run(*args) function following the project's tool interface
• Converts decimal integer input into the corresponding binary string using Python's built-in conversion
• Included the required metadata (tool, description, author, and example) to match the existing tool format

Example

decimal_to_binary "10" -> "1010"

[abduznik]

Hey! Thanks for the contribution. Before merging, please add the issue number this tool addresses in your PR description.

For example, if this tool is for issue #123, add:
Closes #123

This helps us track which issues are being resolved by each PR. Let me know if you have any questions!

[abduznik]

Hey! Just a reminder - the PR title still needs to be fixed:

Change: eat: add decimal_to_binary tool
To: [tool] decimal_to_binary

Once fixed, we can merge!