refactor(derive): Merge handling of bool/from_flag #3782
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This will make it easier to divide off parser logic for adding in actions. This does mean we can't provide error reporting on bad values with `bool` but - We should have also been doing that for `from_flag` - We'll be dropping this soon in clap4 anyways
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This is the derive support for clap-rs#3774 (see also clap-rs#3775, clap-rs#3777) This combined with `value_parser` replaces `parser`. The main frustration with this is that `ArgAction::Count` (the replacement for `parse(from_occurrences)` must be a `u64`. We could come up with a magic attribute that is meant to be the value parser's parsed type. We could then use `TryFrom` to convert the parsed type to the user's type to allow more. That is an exercise for the future. Alternatively, we have clap-rs#3792. Prep for this included - clap-rs#3782 - clap-rs#3783 - clap-rs#3786 - clap-rs#3789 - clap-rs#3793
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This will make it easier to divide off parser logic for adding in
actions.
This does mean we can't provide error reporting on bad values with
boolbutfrom_flag