RFR: Make attributes mutable [v2]

[Jorn Vernee]

On Wed, 29 Nov 2023 18:34:13 GMT, Maurizio Cimadamore <mcimadamore at openjdk.org> wrote:

>> This PR makes the attribute list associated with a declaration (and a type) mutable. This means that we can now tweak a declaration/type after the fact. While the declaration/type is still immutable, the information attached to it can grow over time. This should be useful to reduce coupling between different steps in the extraction process. I plan to use this to simplify the way we deal with name mangling.
>
> Maurizio Cimadamore has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Drop unused line

Marked as reviewed by jvernee (Committer).

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PR Review: https://git.openjdk.org/jextract/pull/146#pullrequestreview-1758080799