full error message

[anvlkv]

Current errors from typegen can get very puzzling, as e.explanation() doesn't mention concrete types which caused the error.

Example of error message before the change:

TypeTracing("\nTwo formats computed for the same entity do not match. This can happen if custom implementations of\nthe Serialize and Deserialize traits do not agree, e.g. if one uses `Vec<u8>` and the other one uses `&[u8]`\n(implying bytes) --- see the crate `serde_bytes` for more context in this particular example.\n\nVerify the implementations of Serialize and Deserialize for the given format.\n")

This PR adds full error message to tracing and deserialization errors.

Here's an example error message with this change:

TypeTracing("Incompatible formats detected: TypeName(\"KeyValueOperation\") TypeName(\"NavigateOperation\"): \nTwo formats computed for the same entity do not match. This can happen if custom implementations of\nthe Serialize and Deserialize traits do not agree, e.g. if one uses `Vec<u8>` and the other one uses `&[u8]`\n(implying bytes) --- see the crate `serde_bytes` for more context in this particular example.\n\nVerify the implementations of Serialize and Deserialize for the given format.\n")

[StuartHarris]

Thank you so much for this! I just ran rustfmt and pushed, but looks good to me! 👍

[StuartHarris]

My apologies, I merged this in another PR as my formatting commit seemed to go to the wrong place. Anyway, it's merged now! Thanks for the contribution!