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Provide descriptive error messages (#209)

* feat: provide descriptive error messages

* feat: add summary to `ValidationError`

* test: remove unwanted log output

* fix: remove `key` property from `Failure` type in favor of complex `message` property

* feat: add failcode to validated result object

* refactor: add utils for creating `Result`

* refactor: add utils for creating `Result` for each failcode

* refactor: add dedicated failcode for constraint failure

* refactor: add `details` property to `Failure` object separatedly from `message`

* docs: add comments for failcodes

* style: remove unnecessary newlines

* fix: treat tuple length failure as constraint failure

BREAKING CHANGE: validation result now can contain a failcode and a detailed object enumerating where the validation failed exactly

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