Remove some allocations related to GudelineSet and DoubleCollection

[h3xds1nz]

Description

• Accept stack-allocated arrays internally for GudelineSet.
• Accept params for DoubleCollection with pre-allocated capacity in FrugalStructList<T>.
• Use them in the framework code.

Sample benchmark for GuidelineSet creation

Method	Mean [ns]	Error [ns]	StdDev [ns]	Gen0	Code Size [B]	Allocated [B]
ORIGINAL	298.1 ns	4.57 ns	4.28 ns	0.0329	866 B	552 B
PR__EDIT	257.5 ns	3.55 ns	3.15 ns	0.0281	3,842 B	472 B

[Benchmark]
public GuidelineSet Original() => new GuidelineSet([4.5, 6.5], [4.5, 6.5]);

[Benchmark]
public GuidelineSet PR__EDIT() => new GuidelineSet(new double[] { 4.5, 6.5 }, new double[] { 4.5, 6.5 });

Customer Impact

Improved performance, decreased allocations.

Regression

No.

Testing

Local build.

Risk

Low, just swaps from heap arrays to stack arrays. Part of the speed up comes from the fact the new DoubleCollection doesn't check the thread in params ctor as it makes no sense (further backed with all the code comments) and it can therefore get inlined.

Microsoft Reviewers: Open in CodeFlow