Date/time parsing e.g. when loading a CSV still relies on Exceptions for failure, which is inefficient

[radeusgd]

Currently, our date/time parsing logic, that is used e.g. when loading CSV files is relying on Exceptions to signal parse failure:

enso/std-bits/table/src/main/java/org/enso/table/parsing/BaseTimeParser.java

Lines 21 to 29 in 12c4f29

	protected Object parseSingleValue(String text, ProblemAggregator problemAggregator) {
	for (EnsoDateTimeFormatter formatter : formatters) {
	try {
	return parseStrategy.parse(text, formatter);
	} catch (DateTimeParseException ignored) {
	// TODO I think ideally we should try to return Option instead of throwing, as throwing is
	// inefficient
	}
	}

As we know, that is not very efficient - especially in GUI mode the stack traces tend to be quite big which incurs a significant performance cost to the parsing.

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At some point, we should try to change the implementation to avoid the exceptions - we were already moving in this direction with #6018.