perf: only run PreprocessorSymbols when #if found

[TimothyMakkison]

Check code for #if before running GetSymbolSets. Profiling pegs this method at around 5-7% of runtime.

A similar optimisation could be done for CSharpierIgnore comments, but the logic for this would probably be quite janky.

Benchmarks

Before

Method	Mean	Error	StdDev	Median	Gen0	Gen1	Allocated
Default_CodeFormatter_Tests	132.2 ms	3.14 ms	8.82 ms	128.5 ms	3000.0000	1000.0000	34.57 MB
Default_CodeFormatter_Complex	263.6 ms	5.13 ms	7.02 ms	262.6 ms	5000.0000	2000.0000	53 MB

After

Method	Mean	Error	StdDev	Median	Gen0	Gen1	Allocated
Default_CodeFormatter_Tests	120.8 ms	4.24 ms	12.02 ms	115.6 ms	2000.0000	1000.0000	31.22 MB
Default_CodeFormatter_Complex	245.5 ms	4.91 ms	7.35 ms	243.7 ms	5000.0000	2000.0000	51.73 MB

[TimothyMakkison]

Added check for // csharpier-ignore using SearchValue.

• Not sure about the namings
  • CodeInformation vs CodeFacts, PrinterContextInformation
  • Information vs Facts, MetaData
• The logic to skip calls to HasLeadingCommentMatching could be changed, right now I use if statements before the call, I did consider changing HasLeadingCommentMatching and CSharpierIgnore.HasIgnoreComment to take a context and then check for it there. I don't know which is more idiomatic

This PR should be re-evaluated after #1703 is merged.
Better than #1718

Benchmarks

Preprocessor Check

Method	Mean	Error	StdDev	Median	Gen0	Gen1	Allocated
Default_CodeFormatter_Tests	110.6 ms	2.71 ms	7.41 ms	107.7 ms	2000.0000	1000.0000	31.22 MB
Default_CodeFormatter_Complex	236.4 ms	4.70 ms	7.03 ms	236.5 ms	5000.0000	2000.0000	51.66 MB

Method	Mean	Error	StdDev	Median	Gen0	Gen1	Allocated
Default_CodeFormatter_Tests	110.6 ms	2.10 ms	5.81 ms	108.8 ms	2000.0000	1000.0000	31.22 MB
Default_CodeFormatter_Complex	239.8 ms	4.47 ms	6.27 ms	238.4 ms	5000.0000	2000.0000	51.67 MB

Method	Mean	Error	StdDev	Gen0	Gen1	Allocated
Default_CodeFormatter_Tests	109.5 ms	2.04 ms	3.52 ms	2000.0000	1000.0000	31.22 MB
Default_CodeFormatter_Complex	236.7 ms	4.69 ms	5.40 ms	5000.0000	2000.0000	51.68 MB

Preprocessor + Ignore Check

Method	Mean	Error	StdDev	Median	Gen0	Gen1	Allocated
Default_CodeFormatter_Tests	107.7 ms	2.14 ms	5.81 ms	106.0 ms	2000.0000	1000.0000	31.16 MB
Default_CodeFormatter_Complex	232.5 ms	4.38 ms	7.31 ms	229.9 ms	5000.0000	2000.0000	51.64 MB

Method	Mean	Error	StdDev	Gen0	Gen1	Allocated
Default_CodeFormatter_Tests	107.8 ms	2.15 ms	5.36 ms	2000.0000	1000.0000	31.16 MB
Default_CodeFormatter_Complex	232.9 ms	4.54 ms	7.20 ms	5000.0000	2000.0000	51.69 MB

Method	Mean	Error	StdDev	Median	Gen0	Gen1	Allocated
Default_CodeFormatter_Tests	111.2 ms	3.32 ms	8.98 ms	108.6 ms	2000.0000	1000.0000	31.16 MB
Default_CodeFormatter_Complex	227.2 ms	4.35 ms	7.26 ms	225.9 ms	5000.0000	2000.0000	51.64 MB

Method	Mean	Error	StdDev	Gen0	Gen1	Allocated
Default_CodeFormatter_Tests	106.9 ms	2.71 ms	7.22 ms	2000.0000	1000.0000	31.16 MB
Default_CodeFormatter_Complex	230.6 ms	4.61 ms	6.46 ms	5000.0000	2000.0000	51.59 MB