Add units to ElectricCurrentGradient, PressureChangeRate (#1274)

### Added Units

__ElectricCurrentGradient__:
* AmperesPerMinute
* MilliAmperesPerMinute
* MilliAmperesPerSecond
> I don't know russian, but i copy pasted the unit abbreviation from the
other units. Google says its ok.

__PressureChangeRate__:
* BarsPerSecond
* BarsPerMinute
* MillibarsPerSecond
* MillibarsPerMinute

### Added operators
* Multiplication of __ElectricCurrentGradient__ and
__TimeSpan|Duration__ returns __ElectricCurrent__
* Multiplcation of __PressureChangeRate__ and __TimeSpan|Duration__
returns __Pressure__
* Division of __ElectricCurrent__ by __Time|Duration__ returns
__ElectricCurrentGradient__
* Division of __Pressure__ by __TimeSpan|Duration__ returns
__PressureChangeRate__

> found some operator only use `Duration` and some use both `TimeSpan`
and `Duration`, thats what I went with.


### FIX

__All__ generated files in `UnitsNet/GeneratedCode/Quanities/` had a
change of 1 spacechar.
That's the change in `QuantityGenerator.cs`.

I set `SupportsSIUnitSystem` to `true` in `ElectricCurrentGradientTests`
and added the `BaseUnits` element on AmperesPerSecond in
`ElectricCurrentGradient.json`.
I think thats correct?

---------

Co-authored-by: Andreas Gullberg Larsen <[email protected]>

Author: vKaras1337

Common/UnitDefinitions/ElectricCurrentGradient.json

@@ -10,15 +10,37 @@
     {
       "SingularName": "AmperePerSecond",
       "PluralName": "AmperesPerSecond",
+      "BaseUnits": {
+        "T": "Second",
+        "I": "Ampere"
+      },
       "FromUnitToBaseFunc": "{x}",
       "FromBaseToUnitFunc": "{x}",
+      "Prefixes": [ "Milli" ],
       "Localization": [
         {
           "Culture": "en-US",
           "Abbreviations": [ "A/s" ]
         }
       ]
     },
+    {
+      "SingularName": "AmperePerMinute",
+      "PluralName": "AmperesPerMinute",
+      "BaseUnits": {
+        "T": "Minute",
+        "I": "Ampere"
+      },
+      "FromUnitToBaseFunc": "{x} / 60",
+      "FromBaseToUnitFunc": "{x} * 60",
+      "Prefixes": [ "Milli" ],
+      "Localization": [
+        {
+          "Culture": "en-US",
+          "Abbreviations": [ "A/min" ]
+        }
+      ]
+    },
     {
       "SingularName": "AmperePerMillisecond",
       "PluralName": "AmperesPerMillisecond",

Common/UnitDefinitions/PressureChangeRate.json

@@ -42,7 +42,7 @@
         }
       ]
     },
-	{
+    {
       "SingularName": "MillimeterOfMercuryPerSecond",
       "PluralName": "MillimetersOfMercuryPerSecond",
       "FromUnitToBaseFunc": "{x} * 133.322",
@@ -74,7 +74,7 @@
         }
       ]
     },
-	    {
+    {
       "SingularName": "PoundForcePerSquareInchPerSecond",
       "PluralName": "PoundsForcePerSquareInchPerSecond",
       "FromUnitToBaseFunc": "{x} * 6.894757293168361e3",
@@ -111,6 +111,40 @@
           "AbbreviationsForPrefixes": { "Kilo": [ "ksi/мин", "kipf/in²/мин" ]}
         }
       ]
+    },
+    {
+      "SingularName": "BarPerSecond",
+      "PluralName": "BarsPerSecond",
+      "FromUnitToBaseFunc": "{x} * 1e5",
+      "FromBaseToUnitFunc": "{x} / 1e5",
+      "Prefixes": [ "Milli" ],
+      "Localization": [
+        {
+          "Culture": "en-US",
+          "Abbreviations": [ "bar/s" ]
+        },
+        {
+          "Culture": "ru-RU",
+          "Abbreviations": [ "бар/с" ]
+        }
+      ]
+    },
+    {
+      "SingularName": "BarPerMinute",
+      "PluralName": "BarsPerMinute",
+      "FromUnitToBaseFunc": "{x} * 1e5 / 60",
+      "FromBaseToUnitFunc": "{x} / 1e5 * 60",
+      "Prefixes": [ "Milli" ],
+      "Localization": [
+        {
+          "Culture": "en-US",
+          "Abbreviations": [ "bar/min" ]
+        },
+        {
+          "Culture": "ru-RU",
+          "Abbreviations": [ "бар/мин" ]
+        }
+      ]
     }
   ]
 }

Common/UnitEnumValues.g.json

@@ -298,7 +298,10 @@
     "AmperePerMicrosecond": 1,
     "AmperePerMillisecond": 2,
     "AmperePerNanosecond": 3,
-    "AmperePerSecond": 4
+    "AmperePerSecond": 4,
+    "AmperePerMinute": 11,
+    "MilliamperePerMinute": 6,
+    "MilliamperePerSecond": 14
   },
   "ElectricField": {
     "VoltPerMeter": 1
@@ -1153,7 +1156,11 @@
     "PascalPerMinute": 11,
     "PascalPerSecond": 12,
     "PoundForcePerSquareInchPerMinute": 13,
-    "PoundForcePerSquareInchPerSecond": 14
+    "PoundForcePerSquareInchPerSecond": 14,
+    "BarPerMinute": 16,
+    "BarPerSecond": 23,
+    "MillibarPerMinute": 24,
+    "MillibarPerSecond": 20
   },
   "Ratio": {
     "DecimalFraction": 1,