[foreign-memaccess+abi] RFR: 8296315: Add get/set-AtIndex methods for byte, boolean

[Maurizio Cimadamore]

On Mon, 13 Mar 2023 09:29:45 GMT, Per Minborg <pminborg at openjdk.org> wrote:

> This PR proposes adding four methods for getting and setting `byte` and `boolean` values via index.
> 
> It also contains a drive-by fix of a test where the cases for `short` was missing.

Looks good

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Marked as reviewed by mcimadamore (Committer).

PR: https://git.openjdk.org/panama-foreign/pull/818