Add a log domain for encoding errors and lower the log level

Using a warning is probably too exalted for the current state
of the code, where UTF-8 errors are somewhat expected from
dissectors that are lax about input validation.

Use a debug level with its own "UTF-8" domain instead.

Using a dedicated domain allows to filter on encoding errors and
with some enhancements to the logging subsystem make them fatal
for tracking and debugging purposes.

Using a dedicated domain might have other drawbacks but for now
it seems like the best approach.

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