Add a way to view the core's logs from the UI

Description

Introduces a ring buffer log appender, which can be read using an API call.

Additions

• The ring buffer appender
• A new endpoint returning the entries in the ring buffer
• A new Response constructor for pre-populating the response

Changes

• Logback now also writes to the ring buffer appender

Test and Review

Resolves #194 (closed)

To be filled in by the reviewers

• All of the methods are commented to expectation

• The methods are tested to satisfaction

• There are no unnecessary files present in the MR

• The continuous integration has no problems with the MR

• The MR is filled in as requested (including labels, milestones, and reviewers)

• The documentation is up-to-date

• All nullable parameters are marked as such