Add Femto prefixes to density (#1320)

Hi, I will be happy to add missing Femto prefixes for density units such
as
**Grams per Liter**
**Grams per Deciliter**
**Grams per Milliliter**

---------

Co-authored-by: UNIVERSE\yzharyi <[email protected]>

Author: yzharyi

Common/UnitDefinitions/Density.json

@@ -168,7 +168,7 @@
       "PluralName": "GramsPerLiter",
       "FromUnitToBaseFunc": "{x} / 1",
       "FromBaseToUnitFunc": "{x} * 1",
-      "Prefixes": [ "Pico", "Nano", "Micro", "Milli", "Centi", "Deci" ],
+      "Prefixes": [ "Femto", "Pico", "Nano", "Micro", "Milli", "Centi", "Deci" ],
       "Localization": [
         {
           "Culture": "en-US",
@@ -181,7 +181,7 @@
       "PluralName": "GramsPerDeciLiter",
       "FromUnitToBaseFunc": "{x} / 1e-1",
       "FromBaseToUnitFunc": "{x} * 1e-1",
-      "Prefixes": [ "Pico", "Nano", "Micro", "Milli", "Centi", "Deci" ],
+      "Prefixes": [ "Femto", "Pico", "Nano", "Micro", "Milli", "Centi", "Deci" ],
       "Localization": [
         {
           "Culture": "en-US",
@@ -194,7 +194,7 @@
       "PluralName": "GramsPerMilliliter",
       "FromUnitToBaseFunc": "{x} / 1e-3",
       "FromBaseToUnitFunc": "{x} * 1e-3",
-      "Prefixes": [ "Pico", "Nano", "Micro", "Milli", "Centi", "Deci" ],
+      "Prefixes": [ "Femto", "Pico", "Nano", "Micro", "Milli", "Centi", "Deci" ],
       "Localization": [
         {
           "Culture": "en-US",

Common/UnitEnumValues.g.json

@@ -222,7 +222,10 @@
     "TonnePerCubicFoot": 48,
     "TonnePerCubicInch": 49,
     "TonnePerCubicMeter": 50,
-    "TonnePerCubicMillimeter": 51
+    "TonnePerCubicMillimeter": 51,
+    "FemtogramPerDeciliter": 59,
+    "FemtogramPerLiter": 56,
+    "FemtogramPerMilliliter": 61
   },
   "Duration": {
     "Day": 1,

UnitsNet.NanoFramework/GeneratedCode/Quantities/Density.g.cs

@@ -81,10 +81,16 @@ public class DensityTests : DensityTestsBase
 
         protected override double PicogramsPerDeciLiterInOneKilogramPerCubicMeter => 1e11;
 
+        protected override double FemtogramsPerDeciLiterInOneKilogramPerCubicMeter => 1e14;
+
         protected override double PicogramsPerLiterInOneKilogramPerCubicMeter => 1e12;
 
+        protected override double FemtogramsPerLiterInOneKilogramPerCubicMeter => 1e15;
+
         protected override double PicogramsPerMilliliterInOneKilogramPerCubicMeter => 1e9;
 
+        protected override double FemtogramsPerMilliliterInOneKilogramPerCubicMeter => 1e12;
+
         protected override double MicrogramsPerCubicMeterInOneKilogramPerCubicMeter => 1e9;
 
         protected override double KilogramsPerLiterInOneKilogramPerCubicMeter => 1e-3;