NDRS-974: Get rid of failure #1077
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Currently thiserror crate does not support no_std so while wait for upstream PR[1] to get merged I've used "thiserror" for std case, and for no_std thiserror is hidden under cfg_attr. [1]: dtolnay/thiserror#64
Co-authored-by: Fraser Hutchison <[email protected]>
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Ref: https://casperlabs.atlassian.net/browse/NDRS-974
Removes failure and uses optional thiserror for std case, and for no_std (i.e. wasm32 target) is hidden behind cfg_attr. This complication happens because thiserror does not support no_std upstream but a PR is pending dtolnay/thiserror#64