Remove double lookups on SizeLimitedCache<K, V>, improve performance

[h3xds1nz]

Fixes #4828

Description

While checking out SizeLimitedCache<K, V> yesterday, I've noticed the double lookups on the dictionary and today I've found there's already a corresponding issue for it, hence we should fix it for optimal performance as this is used with glyphs/fonts.

• Use throw helpers over creating new instance of ArgumentNullException directly.
• Remove had even three lookups, so now it just has one.
• Fields that could be readonly have been adjusted.
• Sealed the class, proper naming conventions.
• Node uses auto properties now.

10 capacity, 15 unique additions first, 20 lookups

Method	Mean [ns]	Error [ns]	StdDev [ns]	Gen0	Code Size [B]	Allocated [B]
Original	988.4 ns	9.39 ns	7.84 ns	0.1183	2,045 B	1992 B
PR_EDIT	809.3 ns	9.18 ns	8.14 ns	0.1183	1,820 B	1992 B

Customer Impact

Improved perfomance.

Regression

No.

Testing

Local build, tests with the class.

Risk

Low, just basically compiler warnings.

Microsoft Reviewers: Open in CodeFlow

[h3xds1nz]

Rebased onto main.

[ThomasGoulet73]

@h3xds1nz: Just a ping to let you know that the test failures in this PR were fixed in main, pulling main should fix the failures.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 23 lines in your changes missing coverage. Please review.

Project coverage is 10.95662%. Comparing base (d94671d) to head (ebcfa79).
Report is 19 commits behind head on main.

Additional details and impacted files

@@                 Coverage Diff                 @@
##                main       #9949         +/-   ##
===================================================
- Coverage   10.99508%   10.95662%   -0.03847%     
===================================================
  Files           3215        3215                 
  Lines         648472      648448         -24     
  Branches       71534       71530          -4     
===================================================
- Hits           71300       71048        -252     
- Misses        576170      576410        +240     
+ Partials        1002         990         -12     

Flag	Coverage Δ
Debug	10.95662% <0.00000%> (-0.03847%)	⬇️

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[himgoyalmicro]

LGTM

[himgoyalmicro]

Thank you, @h3xds1nz, for your consistent and valuable contributions. Your hard work is greatly appreciated! 😄

[h3xds1nz]

@himgoyalmicro Thank you as always :)