RFR: JDK-8298528: Clean up raw type warnings in base in bindings and collections packages [v5]

[John Hendrikx]

On Sun, 12 Feb 2023 18:35:40 GMT, Nir Lisker <nlisker at openjdk.org> wrote:

>> Can make these consistent if the approach is agreed upon.
>
> So let's make the list and the set use an instance singleton pattern, like the empty list does.

Fixed

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PR: https://git.openjdk.org/jfx/pull/972