perf: add TrimStart(this StringBuilder

[TimothyMakkison]

Prevents duplication of the result string, saving memory in certain cases, ie. a preprocessor directive at the start of a file.

Benchmarks (timing is inaccurate didn't bother rerunning it)

Before

Method	Mean	Error	StdDev	Gen0	Gen1	Allocated
Default_CodeFormatter_Tests	98.32 ms	1.954 ms	2.327 ms	2000.0000	1000.0000	31.07 MB
Default_CodeFormatter_Complex	206.40 ms	3.671 ms	5.716 ms	5000.0000	2000.0000	54.58 MB

After

Method	Mean	Error	StdDev	Gen0	Gen1	Allocated
Default_CodeFormatter_Tests	86.67 ms	1.675 ms	1.929 ms	2000.0000	1000.0000	31.07 MB
Default_CodeFormatter_Complex	182.89 ms	3.469 ms	6.766 ms	5000.0000	2000.0000	52.47 MB

[belav]

FYI I'm heading to the airport real soon so won't be around for the next 8 days. I may be able to get caught up before I take off.

Hoping to release all of these performance changes along with 1.0 in the next couple weeks, thanks again for all your hard work!

[TimothyMakkison]

FYI I'm heading to the airport real soon so won't be around for the next 8 days. I may be able to get caught up before I take off.

Happy journeys, hope you have a good holiday 😄

Hoping to release all of these performance changes along with 1.0 in the next couple weeks, thanks again for all your hard work!

Looking forward to it. I'm near the end of my changes. See #1551 for a general feel for the final result. I'll have to find a way to benchmark an actual run of multiple files, to see if I've overlooked something.