ref(core-select)!: optionKey is mandatory on ApiDirectives

[GuillaumeNury]

Description

• optionKey is mandatory on ApiDirectives

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This will need to be rebased on RC once #2949 is merged and rc is up-to-date with master. Only this commit is relevant.

This is a breaking change. On all classes that extend ALuCoreSelectApiDirective, apps have to:

class MyDirective extends ALuCoreSelectApiDirective {
+	protected override optionKey = (option: T) => option.id;
}

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