Add benchmark for emoji-regex library #877

Job	Run time
Test Browser on Linux (firefox, main)	45s
Test Browser on Linux (chrome, main)	27s
Test Browser on Linux (firefox, disabled)	1m 2s
Test Browser on Linux (firefox, default)	1m 17s
Test Browser on macOS (safari, default)	1m 48s
Test Browser on macOS (safari, disabled)	1m 25s
Test Browser on Linux (chrome, disabled)	1m 2s
Test Shell (spidermonkey, main)	44s
Test Browser on Linux (chrome, default)	1m 16s
Test Shell (jsc, main)	41s
Test Browser on macOS (safari, main)	1m 1s
Test Build	37s
Test Shell (jsc, default)	2m 58s
Test Shell (spidermonkey, disabled)	1m 42s
Test Shell (spidermonkey, default)	5m 32s
Test Shell (jsc, disabled)	1m 6s
Test Shell (v8, main)	46s
Test Shell (v8, disabled)	1m 41s
Test Shell (v8, default)	2m 29s
	28m 19s

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