Add support for map type

[yordis]

Context

This is adding support for map based on WebAssembly/component-model#554

References

• feat(wit): add map type support wasm-tools#2356
• Add a 'map<K,V>' type WebAssembly/component-model#554

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[alexcrichton]

On a skim this looks like it's all in the right direction, thanks! As as a heads up the wasm-tools deps will be updated in #12254 which'll avoid the need for git deps. I'll take a closer look once this is further along in CI passing tests

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