feat(go): Use type registry to find the correct target type for JSII Proxy

[arnogeurts-sqills]

With this PR, the type that is instantiated as JSII Proxy is looked up from the type registry using the TypeFQDN in the ref. If that type is registered in the type registry AND that type is assignable to the targeted value type, than that type is used to instantiate the JSII proxy.

Fixes #3353 and relates to #2819.

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By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[mergify]

The title of this Pull Request does not conform with [Conventional Commits] guidelines. It will need to be adjusted before the PR can be merged.
[Conventional Commits]: https://www.conventionalcommits.org

[RomainMuller]

Very nice - thank you!

I only have a very minor comment here, and we're ready to ship.

[RomainMuller]

@all-contributors add @arnogeurts-sqills for bug, code

[allcontributors]

@RomainMuller

I've put up a pull request to add @arnogeurts-sqills! 🎉

[mergify]

The title of this Pull Request does not conform with [Conventional Commits] guidelines. It will need to be adjusted before the PR can be merged.
[Conventional Commits]: https://www.conventionalcommits.org

[arnogeurts-sqills]

@RomainMuller do you need/expect anything else from me regarding this PR, or can it be merged?

[RomainMuller]

@RomainMuller do you need/expect anything else from me regarding this PR, or can it be merged?

It'll be merged! I had actually hoped automation would merge it overnight!