rv/rvgen: introduce AutomataError exception class

Replace the generic except Exception block with a custom AutomataError
class that inherits from Exception. This provides more precise exception
handling for automata parsing and validation errors while avoiding
overly broad exception catches that could mask programming errors like
SyntaxError or TypeError.

The AutomataError class is raised when DOT file processing fails due to
invalid format, I/O errors, or malformed automaton definitions. The
main entry point catches this specific exception and provides a
user-friendly error message to stderr before exiting.

Also, replace generic exceptions raising in HA and LTL with
AutomataError.

Co-authored-by: Gabriele Monaco <gmonaco@redhat.com>
Signed-off-by: Wander Lairson Costa <wander@redhat.com>
Reviewed-by: Gabriele Monaco <gmonaco@redhat.com>
Link: https://lore.kernel.org/r/20260223162407.147003-2-wander@redhat.com
Signed-off-by: Gabriele Monaco <gmonaco@redhat.com>

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