[nitter] Add new extractor #2710

Job	Run time
Linter	22s
Select tests from inputs	2s
Run tests (ubuntu-20.04, 2.7, cpython, core, sh)	1m 12s
Run tests (ubuntu-20.04, 3.2, cpython, core, sh)	1m 21s
Run tests (ubuntu-20.04, 3.5, cpython, core, sh)	1m 16s
Run tests (ubuntu-20.04, 3.9, cpython, core, sh)	1m 20s
Run tests (ubuntu-20.04, 3.11, cpython, core, sh)	1m 10s
Run tests (ubuntu-20.04, pypy-2.7, cpython, core, sh)	3m 53s
Run tests (ubuntu-20.04, pypy-3.6, cpython, core, sh)	3m 27s
Run tests (ubuntu-20.04, pypy-3.7, cpython, core, sh)	3m 50s
Run tests (windows-2019, 3.4, cpython, core, bat)	2m 34s
Run tests (windows-2019, 3.4, cpython, nodownload, bat)	2m 3s
Run tests (ubuntu-20.04, 2.7, jython, core, sh)	3m 47s
Run tests (ubuntu-20.04, 2.7, jython, nodownload, sh)	32s
	26m 49s

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