Expose policy governance APIs

[Jim8y]

Summary

• expose missing Policy governance setters/getters and role designation helpers to smart contracts
• add managed transaction attribute wrappers so contracts can inspect native attributes
• update testing harness artifacts and unit tests to cover the new governance APIs

Testing

• dotnet test tests/Neo.SmartContract.Framework.UnitTests/Neo.SmartContract.Framework.UnitTests.csproj --filter NativeTest

[shargon]

The method are duplicated, and it's better to use !string.IsNullOrEmpty

[ajara87]

I think it's possible to simplify the method.

    private static string? TryGetSourceSnippet(string fileName, int startZeroBasedLineNumber, int endZeroBasedLineNumber)
    {
        if (string.IsNullOrWhiteSpace(fileName)) return null;
        var path = Path.IsPathRooted(fileName) ? fileName : Path.Combine(Environment.CurrentDirectory, fileName);

        try
        {
            if (!File.Exists(path))
                return null;

             string[] lines = File.ReadAllLines(path);
             int start = Math.Max(0, startZeroBasedLineNumber);
             int end = Math.Min(lines.Length - 1, Math.Max(startZeroBasedLineNumber, endZeroBasedLineNumber));
             if (start > end) return null;
             return string.Join(Environment.NewLine, lines[start..(end + 1)]).Trim();
        }
        catch { }
        return null;
    }
}

[Jim8y]

no longer needed, this pr now focus on only one task

[Wi1l-B0t]

This is a part of 'Expose policy governance APIs' ?

[Jim8y]

removed, this pr focus on only exposing poliocy govergance API now

[Jim8y]

Rebased on the latest dev, resolved conflicts, and trimmed the branch so it now only exposes the policy/role governance APIs. Added native Policy setters/getters, RoleManagement.DesignateAsRole, TransactionAttribute wrappers, and refreshed the unit tests. NativeTest suite passes (dotnet test ... --filter NativeTest).

[erikzhang]

Why?