fix: OpenZeppelin contracts dependency for asset tokenization

[robbeverhelst]

…on of OpenZeppelin contracts dependency for asset tokenization features

Summary by Sourcery

Documentation:

• Update asset tokenization guide to include instructions for installing OpenZeppelin contracts dependency.

[sourcery-ai]

Reviewer's Guide by Sourcery

This PR updates the asset tokenization documentation to include the necessary steps for installing OpenZeppelin contracts as a dependency. The change focuses on adding installation instructions before the contract implementation section.

No diagrams generated as the changes look simple and do not need a visual representation.

File-Level Changes

Change	Details	Files
Added OpenZeppelin contracts installation instructions	Added npm installation command for @openzeppelin/contracts-upgradeable package Included explanation of the key OpenZeppelin contracts being used (UUPSUpgradeable, OwnableUpgradeable, ERC1155SupplyUpgradeable) Restructured the documentation flow to install dependencies before showing contract code	docs/developer-guides/asset-tokenization.md

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[sourcery-ai]

Hey @robbeverhelst - I've reviewed your changes and they look great!

Here's what I looked at during the review

• 🟢 General issues: all looks good
• 🟢 Security: all looks good
• 🟢 Review instructions: all looks good
• 🟢 Testing: all looks good
• 🟢 Complexity: all looks good
• 🟢 Documentation: all looks good

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