add profiling test cases and script

test/profiling/word/profile_context_word_embs.py

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+import datetime
+
+def run_core():
+	print(datetime.datetime.now(), 'before import')
+	import nlpaug.augmenter.word as naw
+
+	print(datetime.datetime.now(), 'before init')
+	aug = naw.ContextualWordEmbsAug(model_path='bert-base-uncased', model_type="bert", use_custom_api=True)
+	text = 'The quick brown fox jumps over the lazy dog.'
+	print(datetime.datetime.now(), 'before augment')
+	aug.augment([text] * 2)
+	print(datetime.datetime.now(), 'done')
+
+if __name__ == '__main__':
+	run_core()
+

test/run_profile_context_word_embs.sh

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+py-spy record -o profile.svg -- python ./test/profiling/word/profile_context_word_embs.py

test/run_profile_import.sh

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+python -X importtime -c 'import nlpaug' 2> nlpaug-imports.log