8302590: Add String.indexOf(int ch, int fromIndex, int toIndex)

[Raffaello Giulietti]

Hello,

Currently `String` does not expose a method `indexOf(int ch, int fromIndex, int toIndex)`, where the 3rd parameter limits the search to positions up to it (exclusive). JBS issue [1] has been filed as an “Enhancement” to add it to the codebase.

Before preparing a PR and a CSR, I would like to gather opinions and suggestions.

Greetings
Raffaello

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[1] https://bugs.openjdk.org/browse/JDK-8302590

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