refactor(deserialize): don't handle Option specifically #2630
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Summary
A few days ago, while working on #1859, I found some possible simplification.
Because, I am no longer sure that #1859 is a good idea, I decided to extract the main simplifications in this PR.
The idea is to implement
DeserializableforOption.This allows to remove specific handling of
Optionin theDeserializablederive macro.I also simplified the
Mergederive macro, which was more complex than it needed to be.I also removed the implementations that allow an instance to be converted to a partial instance.
It is never used and has a conceptual flaw: it assumes that a field is unset with its default value.
Test Plan
CI should pass.