message: Add converters into server error enums
  Closes
diff: @@ -83,6 +83,15 @@ class ServerCombinedErrorGenerator(
  }
  }
  }
  +
  + for (error in errors) {
  + val errorSymbol = symbolProvider.toSymbol(error)
  + writer.rustBlock("impl From<#T> for #T", errorSymbol, symbol) {
  + rustBlock("fn from(variant: #T) -> #T", errorSymbol, symbol) {
  + rust("Self::${errorSymbol.name}(variant)")
  + }
  + }
  + }
  }
  /**
  