fix(gnovm): recover panics when having unhashable type as map key

[Villaquiranm]

closes #5783

[Gno2D2]

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[davd-gzl]

This comment can be simplified

[davd-gzl]

Looks good. Verified on dc9e0ac: the panic message matches Go for every key shape, and equality and lookup still work for comparable interface-boxed keys.

• Optional: the new filetests only cover the failure path; a small positive-case filetest (a comparable key boxed into map[interface{}]V) would guard the happy path too.

Full review: https://github.com/samouraiworld/gno-agent-workspace/blob/main/reviews/pr/5xxx/5821-unhashable-types-map-keys/1-dc9e0ac00/review_claude-opus-4-8_davd-gzl.md

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