RFR: 8327425: String Template FMT Refactor use call direct instead of MethodHandler

[ExE Boss]

On Tue, 3 Oct 2023 06:19:11 GMT, Shaojin Wen <duke at openjdk.org> wrote:

> Currently FormatItem uses MethodHandler to handle latin1 and utf16, which is not readable. This PR uses direct calls instead of MethodHandler.
> 
> Please review and don't hesitate to critique my approach and patch.

It’s `MethodHandle`, not `MethodHandler`.

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PR Comment: https://git.openjdk.org/jdk/pull/16021#issuecomment-1983432845