Common library bug fixes and code refactoring

[khyativyasargus]

IMPORTANT: All PRs must be linked to an issue (except for extremely trivial and straightforward changes).

Fixes #881

Description
Added support to compare units even if canonical conversion fails & some code refactoring and bug fixes done in common lib

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• I have read and acknowledged the Code of conduct.
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• I have discussed my proposed solution with code owners in the linked issue(s) and we have agreed upon the general approach.
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[omarismail94]

@khyativyasargus this test is failing:

com.google.android.fhir.datacapture.validation.MinValueValidatorTest > should return invalid result when entered value is less than minValue for cqf calculated expression FAILED
    com.google.common.truth.ComparisonFailureWithFacts at MinValueValidatorTest.kt:149

can you fix please