Make Target.MoveAhead() case insensitive

[Marinovsky]

Description

Some months ago we did a refactor to put in camel case format the json backtest results (see d40ec77#diff-61ef02f06dedc5d14baa64cdc98d1341bd9b991ca4c6fef3f7b42743d31819bd). However, we forgot to update the references in lean-cli/lean/components/util/optimization_configurer.py

as well as those in QuantConnect.Optimizer.Launcher/config.example.json

Thus, when running an optimization, the optimization result was always null since no match between the optimization target and the json backtest results was found:

For this reason, I modified the Target.MoveAhead() method to be case insensitive, so that we didn't need to change the other aforementioned files.

Related Issue

Closes lean-cli#507 (QuantConnect/lean-cli#507)

Motivation and Context

With this change, users will be able to run optimizations using lean-cli

Requires Documentation Change

N/A

How Has This Been Tested?

The method Target.MoveAhead() relies on the private static method Target.GetTokenInJsonBacktest() to be case insensitive. Thus I created a unit test with different target test cases (some in capital case others in camel case) and asserted the static method returned the expected value (that could be null) for all of them.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• Refactor (non-breaking change which improves implementation)
• Performance (non-breaking change which improves performance. Please add associated performance test and results)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Non-functional change (xml comments/documentation/etc)

Checklist:

• My code follows the code style of this project.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.
• My branch follows the naming convention bug-<issue#>-<description> or feature-<issue#>-<description>

[Martin-Molinero]

Thank you 👍