Optimize Soroban WASM size & Refactor Heavy Libraries

[Rampop01]

Description

This PR implements rigorous WASM size optimizations for the Soroban smart contract, addressing the binary bloat and porting constraints outlined in the issue. The optimizations significantly reduce the compiled WASM footprint (~50% reduction).

Changes Made

• String Refactoring: Replaced all heavy String::from_str instantiations with lightweight Symbol::new across the contract to eliminate standard library string allocations.
• Panic & Unwrap Optimization:
  • Removed #[derive(Debug)] on custom types and structs to avoid embedding heavy formatting implementations.
  • Removed string messages from panic!("...") and assert!("...") to prevent core::fmt logic from polluting the binary.
  • Substituted standard .unwrap() calls with .unwrap_optimized() (imported from soroban_sdk::unwrap::UnwrapOptimized) to eliminate panic branches during unwrapping.
• Metadata Reduction: Stripped structural doc comments (///, //!) which the Soroban SDK normally compiles into the WASM custom sections (contractspecv0).
• Compiler Profiles: Configured Cargo.toml for maximum size reduction (opt-level = "z", lto = true, codegen-units = 1, panic = "abort", strip = "symbols") and disabled overflow-checks.
• Post-Compilation: Verified size optimization via wasm-opt -Oz.

Impact

• Original Size: ~165KB
• Optimized Size: ~84KB

Closes #86

[Rampop01]

@bakarezainab all checks passed now, kindly review