Type int4range/int8range values before insert/COPY

[kvch]

Problem

When an int4range/int8range value arrives as pgtype.Range[any], pgx cannot encode it to the binary wire format for the target column (the bounds are untyped any), so inserts and bulk COPY fail.

Fix

Normalize int4range and int8range values from pgtype.Range[any] into typed pgtype.Range[int32] / pgtype.Range[int64] before insert/COPY handling (tstzrange already had handling).

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Cherry-picked from @danddanddand (fix/type-integer-range-values).

[github-actions]

Merging this branch will increase overall coverage

Impacted Packages	Coverage Δ	🤖
github.com/xataio/pgstream/pkg/wal/processor/postgres	79.81% (+0.59%)	👍

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Coverage by file

Changed files (no unit tests)

Changed File	Coverage Δ	Total	Covered	Missed	🤖
github.com/xataio/pgstream/pkg/wal/processor/postgres/postgres_wal_dml_adapter.go	94.06% (+0.38%)	202 (+28)	190 (+27)	12 (+1)	👍

Please note that the "Total", "Covered", and "Missed" counts above refer to code statements instead of lines of code. The value in brackets refers to the test coverage of that file in the old version of the code.

Changed unit test files

• github.com/xataio/pgstream/pkg/wal/processor/postgres/postgres_wal_dml_adapter_bulk_test.go