feat: Automatically coerce bools to numbers

[Kn4ughty]

Description

If parsing a DynVal as a number (f64, i64, i32) fails, try to convert to a bool, then return 0 or 1 respectively.

fixes #1353

Usage

This script takes in 1 or 0 to control whether the todo is checked.
:onclick ~/.scripts/todo.py update --id=${id} --checked=${!done*1}`
I could just modify the script but there is probably other uses for different logic.

Additional Notes

I think the as_ functions could be made into a macro like how it is with impl_dynval_from.

It should probably go in the documentation somewhere. I was thinking just under the "simple mathematical operations" dot point but I'm not sure.

Checklist

Please make sure you can check all the boxes that apply to this PR.

• I added my changes to CHANGELOG.md, if appropriate.
• The documentation in the docs/content/main directory has been adjusted to reflect my changes.
• I used cargo fmt to automatically format all code before committing