UnitParser: adding overloads for getting a UnitInfo using a type/name and abbreviation

[lipchev]

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)

[lipchev]

I'm currently using the getters in the AbbreviatedUnitsConverter of the 🐲 project:

            UnitInfo unitInfo;
            if (quantityName != null && unitAbbreviation != null)
            {
                unitInfo = _unitParser.GetUnitFromAbbreviation(quantityName, unitAbbreviation, serializer.Culture);
            }
            else if (unitAbbreviation != null)
            {
                unitInfo = objectType == typeof(IQuantity)
                    ? _unitParser.GetUnitFromAbbreviation(unitAbbreviation, serializer.Culture)
                    : _unitParser.GetUnitFromAbbreviation(Nullable.GetUnderlyingType(objectType) ?? objectType, unitAbbreviation, serializer.Culture);
            }
            else if (quantityName != null)
            {
                unitInfo = _unitParser.Quantities.GetQuantityByName(quantityName).BaseUnitInfo;
            }
            else if (objectType != typeof(IQuantity))
            {
                unitInfo = _unitParser.Quantities.GetQuantityInfo(Nullable.GetUnderlyingType(objectType) ?? objectType).BaseUnitInfo;
            }
            else
            {
                throw new FormatException("The target unit cannot be determined from the provided JSON.");
            }

Technically, if we wanted to- we could make add the serialization project as InternalsVisibleTo and we wouldn't need these at all, but I don't know- might be useful.