[FEAT] Add 'Simulation Budget' tracking to the TransactionResponse

[dotandev]

Description: Developers need a high-level view of CPU/Memory instruction usage directly from the transaction response.

Requirements:

• Extract gas/budget usage from the Soroban simulation trace.
• Expose these as top-level fields in the Go TransactionResponse struct.
• Add unit tests for correct extraction from varied trace outputs.

[Spagero763]

@Spagero763 has applied to work on this issue as part of the Stellar Wave Program's 3rd wave.

i can work on the issue

ℹ️ Repo Maintainers: To accept this application, review their application or assign @Spagero763 to this issue.

[drips-wave]

Congratulations, @Spagero763! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on March 30, 2026.

🧑‍💻 @Spagero763: Please resolve the issue such that the repo's maintainers have enough time to review your contribution before the due date. You'll earn Points for completing the issue on-time, which will make you eligible for a share of the Stellar Wave Program's reward pool.

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[drips-wave]

This issue has been marked as completed by a Drips Wave moderator for @Spagero763 as part of the Stellar Wave Program's 3rd Wave 🥳

Moderator's reason: The issue was resolved and merged in PR: #914

😎 @Spagero763: You earned 200 Points for completing this issue! After the current Wave ends, you'll be eligible for a percentage of the Wave's reward pool based on the percentage of total points you've earned. Learn more here.

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ℹ️ Note: This issue was marked complete via moderation. Points were issued even though the GitHub issue remains open.