[lworld+fp16] RFR: 8341245: Add 'shortest length' toString() to Float16 [v3]

[duke]

On Fri, 4 Oct 2024 14:47:25 GMT, Raffaello Giulietti <rgiulietti at openjdk.org> wrote:

>> Add `Float16.toString()` with the same 'shortest length' properties as of `[Double|Float].toString()`.
>
> Raffaello Giulietti has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Addressing review comments.

@rgiulietti 
Your change (at version f2dc5685772eca6593337c1eb6283d1afdbb2994) is now ready to be sponsored by a Committer.

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PR Comment: https://git.openjdk.org/valhalla/pull/1260#issuecomment-2429086991