fix: use valid default config in ConsoleDriverModule.forRoot

[LayZeeDK]

PR Checklist

Please check if your PR fulfills the following requirements:

• The commit message follows our guidelines: CONTRIBUTING.md#commit
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

[x] Bugfix
[ ] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[ ] Build related changes
[ ] CI related changes
[ ] Documentation content changes
[ ] Other... Please describe:

What is the current behavior?

An empty object is used as the default LogDriverConfig when no configuration is passed to the ConsoleDriverModule.forRoot method. An empty object does not property implement the LogDriverConfig interface as a levels property is required even though it can be undefined.

Issue Number: N/A

What is the new behavior?

The defaultLogDriverConfig is used when no configuration is passed to the ConsoleDriverModule.forRoot method.

Does this PR introduce a breaking change?

[ ] Yes
[x] No

Other information

A test suite for the ConsoleDriverModule was added.