Fix InterpolationTokenRenderer appending value without culture formatting

[patrikwlund]

The value is only formatted for the correct culture if the token requests that the value is escaped (i.e. obj.EscapeResult). Otherwise it just calls StringBuilder.Append() with the raw value, which does not use the configured culture of our CompilationSettings.

Benchmarks

I did not notice any meaningful difference in benchmarks. I included Nustache as a baseline.

Method	Index	Mean	Error	StdDev	Renderer	Gen 0	Gen 1	Allocated
Stubble_Before	1	743.0 ns	10.94 ns	9.70 ns	Stubble	0.4292	0.0038	3 KB
Nustache_Before	1	12,082.0 ns	231.74 ns	317.21 ns	Nustache	3.6774	0.0916	23 KB
Stubble_After	1	725.8 ns	11.44 ns	10.70 ns	Stubble	0.4292	0.0038	3 KB
Nustache_After	1	11,601.8 ns	122.77 ns	108.83 ns	Nustache	3.6774	0.0916	23 KB

Background

I noticed this issue because these two interpolation tests failed on my PC:

• Triple Mustache Decimal Interpolation
• Ampersand Decimal Interpolation

Expected: "1.21 jiggawatts!"
Actual:   "1,21 jiggawatts!"

My PC has Swedish formatting settings and thus uses , instead of . as a decimal separator.