Fix typo, file handle leaks, Hearst pattern, and scorer span pairing

[Chessing234]

Summary

• Fix typo constuctor → constructor in CandidateGenerator error message (fix: typo 'constuctor' → 'constructor' in CandidateGenerator error message #601)
• Close file handles in read_full_med_mentions(), read_ner_from_tsv(), and evaluate_ner() (fix: unclosed file handles in read_full_med_mentions() and read_ner_from_tsv() #599, fix: unclosed file handle in evaluate_ner() when dumping metrics #597)
• Fix which_look_like Hearst pattern using hypernym instead of hyponym at end (fix: which_look_like Hearst pattern uses hyponym twice instead of hypernym #595)
• Fix PerClassScorer untyped span pairing by iterating predicted spans directly instead of zipping with a set (fix: set-list zip produces incorrect span pairings in PerClassScorer (candidate_generation.py) #592)

Test plan

• Run pytest tests/test_data_util.py
• Run existing NER evaluation scripts on sample data
• Verify Hearst pattern extraction on phrases like "cells which look like fibroblasts"

Fixes #601, #599, #597, #595, #592

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