feat: outputTruncateLength option

[Aslemammad]

Resolves #962

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[Dragomir-Ivanov]

Thanks for your feature.
Looking at the commit it looks like that this is only length of the lines. I.e. more than 80 columns.
Is there any option to modify number of lines output. I have some big JSON structures to diff.

Thanks.

[Inviz]

I want to join to this, it is quite unusable with short diff atm @Aslemammad

[Inviz]

Oh there's an option now. This can work. However I think diff reporter is the weakest part of vitest experience atm.

[Aslemammad]

@Inviz Feel free to create an issue that helps us with improving the diff reporter!