Implement XdrCodec for SCVec

[Emrys02]

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SCVec handles arrays of values in Soroban. Implementing XdrCodec for it will simplify handling contract inputs and outputs.

Implementation Guidelines Key Files: crates/core/src/xdr/codec.rs.

Expectations What done looks like: SCVec implements XdrCodec, allowing round-trip XDR serialization.

For any question, reach me on Discord: emry_ss

[Osuochasam]

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

Please assign me this issue

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Congratulations, @codeZe-us! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on April 29, 2026.

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