Clients and codecs should be validated transitively at injector creation

[electrum]

When binding a client or codec, Swift should validate the client or codec and all of its dependent codecs when the injector is created. Currently, this seems to happen lazily at runtime, so an infrequently called method or used field won't be detected until it is already in production (assuming it is not explicitly covered by tests).

This will make it much easier to get full test coverage of all structs and catch problems like missing the new requirement that classes be final. It should be enough for a test to simply bind the client.

[Deleted user]

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