Use IReadOnlyList type-matching to avoid enumerator allocation.

[AndreReise]

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Addresses #278

Benchmarks result

BenchmarkDotNet v0.14.0, Windows 10 (10.0.19045.5247/22H2/2022Update) Intel Core i5-10300H CPU 2.50GHz, 1 CPU, 8 logical and 4 physical cores .NET SDK 9.0.201 [Host] : .NET 8.0.15 (8.0.1525.16413), X64 RyuJIT AVX2 DefaultJob : .NET 8.0.15 (8.0.1525.16413), X64 RyuJIT AVX2

Before

Method	Mean	Error	StdDev	Ratio	RatioSD	Gen0	Allocated	Alloc Ratio
SerilogOnly	156.9 ns	1.23 ns	1.15 ns	1.00	0.01	0.0381	160 B	1.00
SimpleEvent	287.7 ns	2.51 ns	2.34 ns	1.83	0.02	0.0954	400 B	2.50
Template	359.9 ns	2.30 ns	2.04 ns	2.29	0.02	0.1144	480 B	3.00
StringScope	563.6 ns	4.04 ns	3.78 ns	3.59	0.03	0.2518	1056 B	6.60
TemplateScope	748.9 ns	12.41 ns	11.61 ns	4.77	0.08	0.3052	1280 B	8.00
TupleScope	512.4 ns	4.54 ns	4.02 ns	3.27	0.03	0.2232	936 B	5.85
DictionaryScope	531.2 ns	5.03 ns	4.46 ns	3.39	0.04	0.2670	1120 B	7.00
Capturing	703.1 ns	6.94 ns	5.80 ns	4.48	0.05	0.1850	776 B	4.85
CapturingScope	1,183.7 ns	17.00 ns	15.07 ns	7.55	0.11	0.4368	1832 B	11.45
LogInformationScoped	1,193.6 ns	14.11 ns	13.20 ns	7.61	0.10	0.4368	1832 B	11.45
LogInformation_WithEventId	794.8 ns	4.67 ns	4.14 ns	5.07	0.04	0.2441	1024 B	6.40

After

Method	Mean	Error	StdDev	Ratio	RatioSD	Gen0	Allocated	Alloc Ratio
SerilogOnly	155.1 ns	1.33 ns	1.24 ns	1.00	0.01	0.0381	160 B	1.00
SimpleEvent	272.4 ns	1.34 ns	1.25 ns	1.76	0.02	0.0801	336 B	2.10
Template	328.5 ns	1.59 ns	1.49 ns	2.12	0.02	0.0992	416 B	2.60
StringScope	553.6 ns	5.53 ns	5.17 ns	3.57	0.04	0.2365	992 B	6.20
TemplateScope	714.0 ns	6.66 ns	5.91 ns	4.60	0.05	0.2899	1216 B	7.60
TupleScope	509.1 ns	9.61 ns	10.28 ns	3.28	0.07	0.2079	872 B	5.45
DictionaryScope	553.3 ns	5.68 ns	4.75 ns	3.57	0.04	0.2518	1056 B	6.60
Capturing	713.6 ns	7.60 ns	7.11 ns	4.60	0.06	0.1698	712 B	4.45
CapturingScope	1,163.2 ns	14.61 ns	12.20 ns	7.50	0.10	0.4215	1768 B	11.05
LogInformationScoped	1,163.0 ns	17.38 ns	13.57 ns	7.50	0.10	0.4215	1768 B	11.05
LogInformation_WithEventId	795.2 ns	15.27 ns	15.68 ns	5.13	0.11	0.2289	960 B	6.00

CC @nblumhardt