Parse Soroban Transaction XDR

[grantfox-oss]

Description:
Implement XDR parsing utilities to extract data from Soroban transaction envelopes.

Tasks:

• Add stellar-xdr crate for XDR type definitions
• Create src/utils/xdr_parser.rs
• Implement parse_soroban_invoke(xdr: &str) -> Result<SorobanInvocation, ParseError>
• Extract: invoked contract ID, function name, function arguments
• Write unit tests with real transaction XDR samples

Acceptance Criteria:
XDR parser correctly extracts contract, function, and arguments from sample transactions.

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[Mystery-CLI]

I have read through the required implementations and understand what to do can i work on it?

[Eniola3321]

please can i work on the issue

[grantfox-oss]

🦊 GrantFox — @Eniola3321 has been assigned to this issue as part of the Official Campaign campaign!

Next steps:

1. Open a Pull Request referencing this issue (e.g., Closes #51)
2. Your PR will be reviewed by the Dfunder maintainers

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