Add CodSpeed continuous performance benchmarks - #389

• medium document with a fresh parser instance: 11.3 ms
• medium document without auto-close: 7.9 ms
• medium document without default plugins: 5.9 ms
• large document: 91.9 ms
• medium document: 10.3 ms
• small document: 3.5 ms
• all of the above combined: 14.2 ms
• baseline (default plugins only): 14.6 ms
• emoji: 18 ms
• footnotes: 9.3 ms
• punctuation: 9.4 ms
• security: 11.9 ms
• summary: 9.2 ms
• toc: 10 ms
• medium document: 11.7 ms
• large document: 38.5 ms
• medium document: 8.6 ms
• large document: 40.6 ms
• medium document: 14.3 ms
• small document: 912.5 µs
• ...

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