feat: support number and quantity type parameters

[carvantes]

Description of changes:

number and quantity search param types are similar. quantity is essentially a number with units(expressed via system + code)

https://www.hl7.org/fhir/search.html#number
https://www.hl7.org/fhir/search.html#quantity

key features:

• Implicit range according to number of significant digits.

  Searching on decimals involves an implicit range. The number of significant digits of the implicit range is the number of digits specified in the search parameter value, excluding leading zeros. So 100 and 1.00e2 both have the same number of significant digits - three

  [parameter]=100.00 | Values that equal 100, to 5 significant figures precision, so this is actually searching for values in the range [99.995 ... 100.005)

• Quantity type allows to specify system and code

• Prefixes. Behavior is mostly the same as the prefixes for Dates. Some refactoring was done to reuse prefixes code across several query types.

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[nguyen102]

Overall looks good. One minor change suggestion, and one question.

[nguyen102]

Are all of the 0s before the 5 intended? Why not just 0.005395?

[carvantes]

In practical terms, the number is 0.005395. The ...00005 is rounding error due to floating-point arithmetic. This is fairly standard and is one of the reasons why FHIR proposes comparing against a small range around the number instead of doing equality comparisons for number searches.

https://floating-point-gui.de/