Added validation logic in utils and isEqual function in SignatureData

[jimni1222]

Proposed changes

This PR introduces adding some validation logic to test with conformance TC.

And the reason for deleting the line if (_.isObject(unitString) && unitString.unit) unitString = unitString.unit is that the convertToPeb and convertFromPeb functions call the toPeb and fromPeb functions.
Since each function calls getKlayUnitValue internally, duplicate logic was removed by adding validation logic to getKlayUnitValue and changing it to be verified together.

And also i added isEqual function in SignatureData to compare signature easily.

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