Define WasteType Enum

[Fidelis900]

Title: Implement WasteType Enum in Rust
Labels: smart-contract, data-types
Priority: High
Estimated Time: 15 minutes
Dependencies: #1

Description:
Port the WasteType enum from Cairo to Rust for Stellar Soroban.

Tasks:

• Define enum with variants: PAPER, PETPLASTIC, PLASTIC, METAL, GLASS
• Implement Soroban storage traits (TryFromVal, TryIntoVal)
• Add Display trait for string conversion
• Add unit tests for serialization

Code Reference (Cairo):

pub enum WasteType {
    PAPER,
    PETPLASTIC,
    PLASTIC,
    METAL,
    GLASS,
}

Acceptance Criteria:

• Enum compiles without errors
• Can be stored in Soroban storage
• Tests pass for all variants

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[Mystery-CLI]

@Mystery-CLI has applied to work on this issue as part of the Stellar Wave Program's 2nd wave.

can i work on this issue

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