Adds Sortino Ratio to Algorithm Statistics and Report

[AlexCatarino]

Expected Behavior

The Sortino Ratio is available in Algorithm Statistics and Report.

Actual Behavior

The Sortino Ratio is not available in Algorithm Statistics and Report, but it is calculated in Lean.

Potential Solution

Adds the Sortino Ratio value to the results. It's a popular statistics metric that has been used in Alpha Streams portfolio optimization.

Checklist

• [x] I have completely filled out this template
• [x] I have confirmed that this issue exists on the current master branch
• [x] I have confirmed that this is not a duplicate issue by searching issues
• [x] I have provided detailed steps to reproduce the issue

[ikamanu]

Thank you!