More informative error messages

[smlmbrt]

Hard to debug certain error messages for users as the assertions don't list the problematic variants (e.g. duplicate IDs, PGScatalog/pgsc_calc#72 (comment)). Should consider adding list of scoring files/variants that are causing the breakage

Relevant code snippet:

pgscatalog_utils/pgscatalog_utils/match/combine_matches.py

Lines 39 to 48 in 5bd8a2b

	def _check_duplicate_vars(matches: pl.LazyFrame):
	max_occurrence: list[int] = (matches.filter(pl.col('match_status') == 'matched')
	.groupby(['accession', 'ID'])
	.agg(pl.count())
	.select('count')
	.max()
	.collect()
	.get_column('count')
	.to_list())
	assert max_occurrence == [1], "Duplicate IDs in final matches"

[smlmbrt]

I think here we need to output: ['accession', 'ID', [list of affected scoring file row_nr]] that way we can grep the relevant rows of pvar and scoring file to see what's wrong