[code-reflection] RFR: Build extern type element tree

[Paul Sandoz]

On Fri, 2 May 2025 20:58:09 GMT, Paul Sandoz <psandoz at openjdk.org> wrote:

> The model that builds the model now explicitly builds the externalized type element tree rather than parsing it from the string form. Externalized type element instances are reused.

This PR also fixed an issue where the array operation operands were incorrect (the index and element values were the swapped - it worked because the incorrect order was consistently used).

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PR Comment: https://git.openjdk.org/babylon/pull/419#issuecomment-2848114765