[foreign-memaccess+abi] RFR: Split Stream operations, fix final and class properties

[Maurizio Cimadamore]

On Mon, 19 Sep 2022 12:20:41 GMT, Per Minborg <duke at openjdk.org> wrote:

> This PR splits Stream operations into separate lines, and fixes some `final` and class issues.
> 
> Some smaller issues are also fixed not related to the above.

please remove the changes to `final` from this PR.

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PR: https://git.openjdk.org/panama-foreign/pull/724