feat(core): implement XdrDiff for AccountEntry

[webdevayo]

Here is the final PR description for you to copy and paste into GitHub. I've included a note at the bottom to let the maintainers know about the unrelated broken tests you found on main, as well as the quick import fixes you applied.

Title: feat(core): implement XdrDiff for AccountEntry
Description

This PR introduces a specialized XDR diffing utility for AccountEntry structures to effectively track native Stellar account mutations alongside Soroban contract changes. This ensures that exact XLM balance shifts (such as gas fee deductions) and sequence number increments are clearly mapped and highlighted in the debugger output, removing the need for developers to manually parse raw XDR.
Related Issue

Closes #453
Proposed Changes

XDR Diffing Implementation: Added the diff_account_entry(old: &AccountEntry, new: &AccountEntry) function within crates/core/src/xdr/diff.rs.

Field Tracking: Implemented granular comparison logic for key account fields:

    balance: Formats and highlights precise XLM deductions (e.g., transaction fees) and additions.

    seqNum: Tracks and isolates sequence number increments.

    numSubEntries: Diffs changes in sub-entry counts.

    signers: Maps additions, removals, and weight modifications of account signers.

Housekeeping: Cleaned up some pre-existing broken imports in crates/core/src/decode/mod.rs and contract_error.rs to get the crate compiling cleanly.

Testing & Validation

[x] Added unit tests verifying accurate delta calculations for XLM balance reductions and additions.

[x] Added unit tests verifying seqNum increments.

[x] Added unit tests simulating signer additions, removals, and weight updates.

[x] Verified my new tests pass with cargo test -p prism-core.

[x] Passed strict linting via cargo clippy --all-targets -- -D warnings.

[x] Formatted via cargo fmt --all.

Note to reviewers: While all my new tests pass, cargo test -p prism-core currently has 4 failing tests related to taxonomy::loader and severity_tests (e.g., Storage code 4 (NearExpiry)). These appear to be broken on main and fall outside the scope of this PR, so I bypassed the test hooks to get this up for review.

Checklist

[x] I have reviewed my code and ensured it follows the repository's Rust style and formatting guidelines.

[x] I have added comprehensive tests that prove my feature works as intended.

[x] I have verified the diff output highlights XLM deductions correctly.

[x] I have joined the contributor Telegram group.

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[codeZe-us]

@webdevayo fix the conflicts