Logger Refactoring & display logs in SSR

[lukeromanowicz]

What is the motivation for adding/enhancing this feature?

Logger has a lot of lines where the code could be slightly improved.
It is also lacking unit tests.
Last but not least, showing most of the logs in SSR is omitted and there is no way to display them.

What are the acceptance criteria

• Logger has unit tests
• Logger has improved code quality
• It is possible to display debug and info in SSR
• Only errors are shown by the default configuration.

Can you complete this feature request by yourself?

• YES
• NO

Which Release Cycle state this refers to? Info for developer.

Pick one option.

• This is a normal feature request. This should be available on https://test.storefrontcloud.io and then after tests this can be added to next Vue Storefront version. In this case Developer should create branch from develop branch and create Pull Request 2. Feature / Improvement back to develop.
• (Pick this option only if you're sure) This is an important improvement request for current Release Candidate version on https://next.storefrontcloud.io and should be placed in next RC version. In this case Developer should create branch from release branch and create Pull Request 3. Stabilisation fix back to release.
• (Pick this option only if you're sure) This is a critical improvement request for current Stable version on https://demo.storefrontcloud.io and should be placed in next stable version. In this case Developer should create branch from hotfix or master branch and create Pull Request 4. Hotfix back to hotfix.

Additional information