Adds eval, lags, corr and season commands to the econometrics menu

[northern-64bit]

Description

Adds eval (from the economy menu), lag (a new command), corr and season (from the forecast menu) commands to the econometrics menu.

How has this been tested?

Running the commands and getting the same/expected results as run in the other menus.

• Make sure affected commands still run in terminal
• Ensure the SDK still works
• Check any related reports

Checklist:

• I have adhered to the GitFlow naming convention and my branch name is in the format of feature/feature-name or hotfix/hotfix-name.
• Update our documentation following these guidelines. Update any user guides that are affected by the changes.
• Update our tests following these guidelines.
• Make sure you are following our CONTRIBUTING guidelines.
• If a feature was added make sure to add it to the corresponding integration test script.

Others

• I have performed a self-review of my own code.
• I have commented my code, particularly in hard-to-understand areas.

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (develop@1171b91). Click here to learn what that means.
Patch has no changes to coverable lines.

Additional details and impacted files

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[jmaslek]

After loading in a dataset, season has no autocomplete options (same with corr, lag, eval, etc.):

[jmaslek]

Unlabeled seasonality plot

[jmaslek]

lag does not create a new variable: it overwrtites the current one

[northern-64bit]

@jmaslek All issues should now have been fixed, except for labels on the plot of the season command.

This hasn't been done since this is a general issue (which also impacts the season command of the forecast menu) with add_corr_plot of plotly_helper. I can't see a good solution for this due to each line is added as it's own scatter. Therefore I'll create a new issue for it.

[jmaslek]

Nice one!