Some suggested improvements (#16)

This PR contains the work done to make some overall improvements to the library:
* Fixed code duplication from supporting multiple Swift version in the `AmiiboLiveClient` client;
* Improved the error handling from the client's calls in the `AmiiboLiveClient` client;
* Conformed to `AmiiboLiveClient` and the filter types to the `Sendable` protocol;
* Added the "transport" argument to the initializer of the `AmiiboLiveClient` client;
* Updated the `DocC` library documentation.

Reviewed-on: #16
Co-authored-by: Javier Cicchelli <javier@rock-n-code.com>
Co-committed-by: Javier Cicchelli <javier@rock-n-code.com>

docs/index/index.json

@@ -1 +1 @@
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