fix: catch all exceptions in forked process

[jjaakola-aiven]

If base exception is raised the communication queue will block in the calling process and will cause timeouts. This is prevalent in unit test for protobuf serialization in Github Actions, caused by the protobuf compiler work directory existence. The fix is to use pathlib.Path with exists=True and parents=True for removing the FileExistsError and also changing the error handling logic to pass back also BaseExceptions through the multiprocess queue.

About this change - What it does

References: #xxxxx

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Coverage report

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File	Statements	Missing	Coverage	Coverage (new stmts)	Lines missing
karapace
utils.py
karapace/kafka
common.py
karapace/protobuf
field_element.py
io.py
proto_file_element.py
proto_normalizations.py
schema.py
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