Make colorlog optional for the logger

[Daraan]

    # TODO: # CRITICAL: adjust log message if colorlog is not found.

KnowledgeGraphTransformer/tools/logger.py

Line 11 in dc0f579

import hydra

[Daraan]

Can now be adjusted by commenting out this line

KnowledgeGraphTransformer/conf/config.yaml

Line 77 in e16376e

- ./job_logging@hydra

Not tested yet