Refactor: Add support filtering out unwanted log messages

[glensc]

Filter out common noise, that can't do much anyway.

Example:

logging:
  filter:
    # Filter out all messages with level WARNING
    - level: WARNING
    # Filter out message with level WARNING and containing a text
    - level: WARNING
      message: "not found on Trakt"
    # Filter out these, not checking the level
    - message: "because provider local has no external Id"
    - message: "because provider none has no external Id"
    - message: "Retry using search for specific Plex Episode"

[glensc]

After filtering out WARNING noise, I noticed that the progress bar wouldn't reach 100% because skipped items don't increment progress.

[glensc]

Removing "continue" statements on None conditions did not change anything. still not reaching 100%. Something else is wrong. And the progress outcome is different on every run: 71/100, 73/100, 93/100, 96/100

[glensc]

Merging. Leaving documentation for community to pick up.