Add string.boolean.parse keyword

[aelesia]

Request a feature

Add string.boolean.parse to support parsing boolean strings

🤷 Motivation

string.integer.parse and string.numeric.parse exist, but there's no equivalent for booleans. Parsing "true"/"false" strings from environment variables, query params, and serialized data is a common use case.

💡 Solution

Add string.boolean and string.boolean.parse following the exact same pattern as stringInteger/stringNumeric in string.ts. Validate that the string is "true" | "false", then morph it into a boolean

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Happy to open a PR for this.

[pullfrog]

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