Soroban Rust: Add Metadata Storage and Retrieval

[manoahLinks]

Implement functionality within Soroban Rust contracts to store and retrieve associated metadata, such as token URIs or contract descriptions.

[Sage-senpai]

@Sage-senpai has applied to work on this issue as part of the Stellar Wave Program's 4th wave.

GM maintainers
I'm sage, a Fullstack developer and Blockchain Engineer with over 5 years of pratical and rewarded experience. i would love to work on this issue and can guarantee an efficient PR withing 6 hours of approval

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