Convert rsk_protocalVersion return value to hex

[rmoreliovlabs]

Description

Updated the eth_protocolVersion method so its return value is a hexadecimal String instead of an Integer.

Motivation and Context

As per the Rootstock documentation the eth_protocolVersion method should return the current ethereum protocl version number as a hexadecimal, but it currently returns it as a decimal number.

How Has This Been Tested?

curl --location 'http://localhost:4444' \
--header 'Content-Type: application/json' \
--data '{
	"jsonrpc":"2.0",
	"id":666,
	"method":"eth_protocolVersion"
}'

// Should return
{"jsonrpc":"2.0","id":666,"result":"0x32"}

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:

[sonarqubecloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

100.0% Coverage
0.0% Duplication