feat: introduce support for struct<->dict (de)serialization #459
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This extends the functionality of
SDBUSCPP_REGISTER_STRUCTmacro.It now provides functionality for serializing a user-defined struct as an
a{sv}dictionary, and for deserializing ana{sv}dictionary into a user-defined struct. The former one is achieved by decorating the struct withsdbus::as_dictionary(struct), the latter one is an automatic behavior -- when sdbus-c++ is asked to deserialize into a struct but the data in the message is of typea{sv}, then the dict-to-struct deserialization is performed automatically.There are some aspects of behavior in the serialization/deserialization functionality that can be customized by the client. Newly introduced
SDBUSCPP_ENABLE_NESTED_STRUCT2DICT_SERIALIZATIONandSDBUSCPP_ENABLE_RELAXED_DICT2STRUCT_DESERIALIZATIONmacros serve the purpose.Closes #397