[RELAY][ConvertLayout] Make missing desired layout non-fatal #6553
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When ConvertLayout encounters an operator which is supported by ConvertLayout but a desired_layout is not provided by the user, it will create a fatal error. With this PR, it will instead just give a warning and leave that operator how it was.
Currently, anytime a new operator is added to ConvertLayout, it will break ConvertLayout for anyone using it in their code. For example, a BYOC target may want all Conv2D ops to be converted to NCHW but doesn't care about the layout of other ops. They shouldn't have to specify a desired layout for every single op which is supported by ConvertLayout, only the ones which they care about.