Make JSONToken.String.makeString() public

[Copilot]

Users implementing JSONTokenizerDestination receive a JSONToken.String in stringFound() but had no public API to decode the raw bytes into a Swift String with proper escape handling — forcing them to copy-paste the internal implementation.

Changes

• JSONToken.String.makeString(from:unicode:) — both the Span<UInt8> and [UInt8] overloads are now public

Usage

struct MyDestination: JSONTokenizerDestination {
    let bytes: [UInt8]

    mutating func stringFound(_ string: JSONToken.String) {
        let value = string.makeString(from: bytes, unicode: true)
        // use value
    }
}