Fix structure SQL statement splitting - #293
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Structure loading previously split SQL at every semicolon, corrupting valid statements with semicolons inside string literals or comments. This replaces the naive split with a scanner that recognizes quoted values and identifiers, escaped or doubled quote characters, and line or block comments. It adds regression coverage that restores tables from statements containing a semicolon in a string default and in both comment styles.
Tested with
mix test test/ecto/adapters/clickhouse/structure_test.exs(7 tests, 0 failures).