[code-reflection] RFR: Make Quotable a marker interface [v9]

[Paul Sandoz]

On Mon, 13 Jan 2025 17:20:38 GMT, Mourad Abbay <mabbay at openjdk.org> wrote:

>> In this PR, we make Quotable a marker interface. This PR is based on #301.
>
> Mourad Abbay has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Make Quotable LambdaOp Invocation Handler an inner anonymous class

Looks good. Before you integrate can you update the JavaDoc `ofQuotable` to say that if the Quotable instance is proxied, e.g., via [X]or [Y], then the quoted code model is made inaccessible to the proxy.

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Marked as reviewed by psandoz (Lead).

PR Review: https://git.openjdk.org/babylon/pull/302#pullrequestreview-2547833567