Refactor ValidationResult, ValidationError, ValidationSeverity #1259
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Overview
Artifacts:
Currently located in SPI:
By design Validation artifacts are generic and can be exposed in user's public API, such as Gurad Rails , and action validators.
Hence, moved artifacts to '''common.core.validation" package for re-usability.
Note: this PR only addrsses rellocation of Validation artifacts, and low code coverage will be addressed as part of coming Guard Rail functionality implementation.