fix: typo, file handle leaks, Hearst pattern, and scorer span pairing

[Chessing234]

Summary

• Fix typo constuctor → constructor in CandidateGenerator error message (Fixes fix: typo 'constuctor' → 'constructor' in CandidateGenerator error message #601)
• Close file handles in read_full_med_mentions() and read_ner_from_tsv() using context managers (Fixes fix: unclosed file handles in read_full_med_mentions() and read_ner_from_tsv() #599)
• Fix which_look_like Hearst pattern using hypernym instead of hyponym at the end of the pattern (Fixes fix: which_look_like Hearst pattern uses hyponym twice instead of hypernym #595)
• Fix incorrect span pairings in PerClassScorer caused by zip(*set(...)) (Fixes fix: set-list zip produces incorrect span pairings in PerClassScorer (candidate_generation.py) #592)
• Close metrics file handle in evaluate_ner() (Fixes fix: unclosed file handle in evaluate_ner() when dumping metrics #597)

Test plan

• Verified typo fix in candidate_generation.py
• Verified file handles use with open(...) in data_util.py
• Verified which_look_like pattern ends with hypernym like adjacent patterns
• Run existing scispacy test suite locally if CI is unavailable

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