fix: preserve length modifier in varchar(n)[] array columns (#420)

[vytautas-karpavicius]

This PR fixes issue #420

• pgschema dump silently dropped the length modifier from array columns whose element type carries a typmod (e.g. varchar(128)[] was emitted as varchar[])
• The inspector SQL used et.typname || '[]' for array types, which discards atttypmod. Non-array types already used format_type(a.atttypid, a.atttypmod) to extract the modifier — array types now do the same
• normalizePostgreSQLType is updated to handle types-with-modifiers (e.g. bpchar(10)[] -> character(10)[]) by decomposing the type name once and doing a single map lookup instead of two

Test plan

• New dump test issue_420_varchar_array_length_modifier covers varchar(128)[] and character(10)[] columns
• Rerun whole test suite with go test ./... -timeout 600s
• Verified manually that repro described in Bug: varchar(n)[] length modifier silently dropped in dump #420 produces expected result

[greptile-apps]

Greptile Summary

This PR preserves length modifiers for character array columns in schema dumps. The main changes are:

• Updates column inspector SQL to append array element typmods.
• Extends PostgreSQL type normalization for mapped names with modifiers.
• Adds an integration fixture for varchar(n)[] and character(n)[] dumps.

Confidence Score: 3/5

This should be fixed before merging.

• Character array typmods are handled for the covered cases.

• Interval array columns with field ranges can be dumped with the wrong type.

• The same SQL expression appears in both column query variants and the generated query file.

• ir/queries/queries.sql

• ir/queries/queries.sql.go

Important Files Changed

Filename	Overview
ir/queries/queries.sql	Adds typmod reconstruction for array column types, but the substring approach can lose interval field ranges.
ir/normalize.go	Normalizes mapped PostgreSQL type names while preserving parenthesized modifiers and suffixes.

_{Reviews (1): Last reviewed commit: "fix: preserve length modifier in varchar..." | Re-trigger Greptile}

[greptile-apps]

Preserve interval fields When an array column uses an interval field range, such as INTERVAL DAY TO SECOND(3)[], format_type(a.atttypid, a.atttypmod) includes both the fields and the precision. This substring only keeps the parenthesized precision, so the dumped type becomes interval(3)[] and drops DAY TO SECOND. That changes the column type semantics in the dump.