Add utility method for displaying CLI separators

[t1m0thyj]

Is your feature or enhancement request related to a problem or limitation? Please describe

There is inconsistency between the length of dividers printed in command output.
As a CLI user, this is a slight inconvenience particularly if my screen width is narrow.
As an extender, it would be convenient to have a method I can call in my own plug-in.

Describe your enhancement idea

Provide a method in Imperative console API for printing a separator line to the terminal.
Consider including an option for minimum width and percent width.

Describe alternatives you've considered

Provide any additional context

zowe-cli/packages/imperative/src/imperative/src/plugins/cmd/install/install.handler.ts

Line 137 in a2a375f

params.response.console.log("\n_______________________________________________________________");

zowe-cli/packages/imperative/src/imperative/src/config/cmd/report-env/EnvQuery.ts

Line 58 in a2a375f

private static readonly divider = `______________________________________________${os.EOL}`;

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