Support for targeting multiple worlds

It would be great to support the ability to create a component that can target the union of multiple worlds in the cases where the user cannot edit the wit file to create a third world that includes the target worlds. An example of this would be an SDK built on top of a wit that bundles the wit in an npm package and the user application wanting to target their world where there would be 2 distinct `wit` folders.

This request is motivated by the ability to do that in `componentize-py` (the [commit](https://github.com/bytecodealliance/componentize-py/commit/20787522a8822ae0ae7d9cdb18c6163cde9e7aac) that added the support).

A issue não menciona arquivos de implementação nem testes. Comece lendo o commit vinculado de componentize-py e acompanhando como o ComponentizeJS lida com as diferentes pastas WIT descritas no exemplo. O trabalho estará concluído quando o ComponentizeJS puder ter como alvo a união de múltiplos Worlds sem exigir que o usuário edite o arquivo WIT, com cobertura para esse cenário.

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