Implement SDK typed network client abstraction

[El-swaggerito]

Description

Difficulty: Expert

Type: Feature

Summary

Implement a typed network client abstraction for Horizon and future Soroban RPC usage.

Current Behaviour

SDK modules may call network services directly, which can lead to duplicated request logic and inconsistent error handling.

Expected Behaviour

The SDK should route network calls through a shared typed abstraction with consistent behaviour.

Suggested Implementation

Create a network client module with typed request methods, timeout handling, response parsing, and SDK error conversion.

Files or Areas Likely Affected

src/network/
src/config/
src/errors/
tests/
docs/

Acceptance Criteria

• A typed network client abstraction is added.
• Existing candidate modules use the abstraction where practical.
• Timeout and response parsing behaviour is consistent.
• Network errors are converted into SDK errors.
• Tests cover successful and failed network responses.

Additional Notes

This should not change public SDK behaviour unless documented.

[Lakes41]

Hello maintainer,

I would like to work on this issue. I have experience building scalable web applications and decentralized blockchain architectures using JavaScript, TypeScript, React, Next.js, Python, and SQL.

My approach will be to investigate the current logic, implement a robust fix, and add the necessary tests. I am focused on ensuring this is a high-quality contribution to the repository.

I am ready to start immediately and will submit a clean pull request for your review shortly.

Best regards.

[grantfox-oss]

🦊 GrantFox — @Lakes41 has been assigned to this issue as part of the Official Campaign | FWC26 campaign!

Next steps:

1. Open a Pull Request referencing this issue (e.g., Closes #157)
2. Your PR will be reviewed by the Axionvera maintainers

Good luck! Track your progress on GrantFox.

[grantfox-oss]

🎉 This issue has been marked as completed on GrantFox as part of the Official Campaign | FWC26 campaign!

@Lakes41's PR #158 was approved and merged by @El-swaggerito.

🏆 @Lakes41: You earned 35 FoxPoints for this contribution! Your current tier: Explorer (659 total points). Track your full progress on GrantFox.

👏 Great work, @Lakes41! Keep contributing to Axionvera.