Problems with Formatting of numbers and dates if you run on non English CultureInfo

[andi0b]

Describe the bug

Formatting values via this library ignores the CultureInfo set to Handlebars.Configuration.FormatProvider.

Numbers and dates will always be formatted with the culture of the current thread. Furthermore there are some tests failing if you run it on a non English locale.

It seems PR #2 broke it.

Expected behavior:

Format JToken with Handlebars.Configuration.FormatProvider

If I set Handlebars.Configuration.FormatProvider to CultureInfo.Invariant I expect numbers to be formatted like 3.14 instead of like my locale would format: 3,14

Test to reproduce

Run current tests on a non English locale (in my case German/Austria) and some will fail:

[xUnit.net 00:00:01.07]     HandlebarsDotNet.Extension.Test.JsonTests.ValueTypes(value: "22474.1") [FAIL]
  Fehler HandlebarsDotNet.Extension.Test.JsonTests.ValueTypes(value: "22474.1") [11 ms]
  Fehlermeldung:
   Assert.Equal() Failure
               ↓ (pos 5)
Expected: 22474.1
Actual:   22474,1
               ↑ (pos 5)
  Stapelverfolgung:
     at HandlebarsDotNet.Extension.Test.JsonTests.ValueTypes(String value) in C:\Users\Andreas\git\github\Handlebars.Net.Extension.NewtonsoftJson\source\Handlebars.Extension.Test\JsonTests.cs:line 50
[xUnit.net 00:00:01.26]     HandlebarsDotNet.Extension.Test.JsonTests.ArrayAccessByIndex(handlebars: HandlebarsEnvironment { Configuration = HandlebarsConfiguration { AliasProviders = [...], BlockHelpers = [...], Compatibility = Compatibility { ... }, CompileTimeConfiguration = CompileTimeConfiguration { ... }, ExpressionNameResolver = null, ... } }) [FAIL]
  Fehler HandlebarsDotNet.Extension.Test.JsonTests.ArrayAccessByIndex(handlebars: HandlebarsEnvironment { Configuration = HandlebarsConfiguration { AliasProviders = [...], BlockHelpers = [...], Compatibility = Compatibility { ... }, CompileTimeConfiguration = CompileTimeConfiguration { ... }, ExpressionNameResolver = null, ... } }) [6 ms]
  Fehlermeldung:
   Assert.Equal() Failure
                        ↓ (pos 14)
Expected: 1,True,False,1.1,,
Actual:   1,True,False,1,1,,
                        ↑ (pos 14)
  Stapelverfolgung:
     at HandlebarsDotNet.Extension.Test.JsonTests.ArrayAccessByIndex(IHandlebars handlebars) in C:\Users\Andreas\git\github\Handlebars.Net.Extension.NewtonsoftJson\source\Handlebars.Extension.Test\JsonTests.cs:line 222

Fehler!      : Fehler:     2, erfolgreich:    25, übersprungen:     0, gesamt:    27, Dauer: 257 ms - Handlebars.Extension.Test.dll (netcoreapp2.1)

I am going to look into this problem and will try to provide a pull request.