Return properly encoded value by eth_getStorageAt RPC method for non-existing keys

[casiojapi]

Description

Updated eth_getStorageAt to return a 32-byte zero value for non-existing keys, aligning with geth client behavior.

Motivation and Context

Ensures compatibility with Ethers.js and other clients like Geth, which expect a 32-byte zero value for non-existing keys.

How Has This Been Tested?

Tested in local development environment; unit tests updated to reflect new return value.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• Tests for the changes have been added (for bug fixes / features)
• Requires Activation Code (Hard Fork)

• Other information:

[sonarcloud]

Quality Gate passed

Kudos, no new issues were introduced!

0 New issues
0 Security Hotspots
100.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud