fix(plpgsql): handle multibyte diagnostic offsets#737
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Prevent PL/pgSQL diagnostics from panicking when source text contains UTF-8 multibyte characters before a reported query span.
The diagnostic mapper now keeps internal source ranges as UTF-8 byte offsets while explicitly converting plpgsql_check's one-based character positions at the boundary. Query lookup also iterates on character boundaries instead of byte-by-byte slices, avoiding invalid string indexing inside characters like umlauts.
Regression Coverage
Added focused tests for umlauts in comments before a query and in string literals before a reported query position.
Fixes #735