HIP-1340: EOA Code Delegation

[0xivanov]

Description:
Implements HIP-1340 (EIP-7702) to enable EOA code delegation, allowing externally owned accounts to delegate code execution to smart contracts.

AccountCreateTransaction

• SetDelegationAddress(address interface{}) *AccountCreateTransaction - Sets the delegated contract address (accepts hex string with/without 0x prefix, or 20-byte slice)
• GetDelegationAddress() []byte - Returns the delegation address, or nil if not set

AccountUpdateTransaction

• SetDelegationAddress(address interface{}) *AccountUpdateTransaction - Sets or clears the delegation address (accepts hex string, 20-byte slice, or nil to clear)
• GetDelegationAddress() []byte - Returns the delegation address, or nil if not set
• Setting to 20 zero bytes or nil clears any existing delegation

AccountInfo

• DelegationAddress []byte - New field exposing the account's delegation address (immutable, nullable)

Related issue(s):

Fixes #1606

Notes for reviewer:

Checklist

• Documented (Code comments, README, etc.)
• Tested (unit, integration, etc.)

[lfdt-bot]

✅ Snyk checks have passed. No issues have been found so far.

Status	Scanner	Critical	High	Medium	Low	Total (0)
✅	Open Source Security	0	0	0	0	0 issues

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[codecov]

Codecov Report

❌ Patch coverage is 93.68421% with 6 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
sdk/account_info.go	50.00%	2 Missing and 1 partial ⚠️
sdk/account_update_transaction.go	94.54%	2 Missing and 1 partial ⚠️

Files with missing lines	Coverage Δ
sdk/account_create_transaction.go	95.92% <100.00%> (+0.50%)	⬆️
sdk/status.go	99.87% <100.00%> (+<0.01%)	⬆️
sdk/account_info.go	62.50% <50.00%> (-0.77%)	⬇️
sdk/account_update_transaction.go	90.06% <94.54%> (+0.99%)	⬆️

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