UnitParser: adding overloads for getting a UnitInfo using a type/name and abbreviation (#1585)

Adding the following (public) methods to the `UnitParser`
- `UnitInfo GetUnitFromAbbreviation(string quantityName, string
unitAbbreviation, IFormatProvider? formatProvider)`
- `UnitInfo GetUnitFromAbbreviation(Type quantityType, string
unitAbbreviation, IFormatProvider? formatProvider)`
- `bool TryGetUnitFromAbbreviation(string quantityName, string?
unitAbbreviation, IFormatProvider? formatProvider, [NotNullWhen(true)]
out UnitInfo? unitInfo)`
- `bool TryGetUnitFromAbbreviation(Type quantityType, string?
unitAbbreviation, IFormatProvider? formatProvider, [NotNullWhen(true)]
out UnitInfo? unitInfo)`

Author: lipchev