perf(postgres): use SQL template casting for non-PK column types (#4)

* perf(postgres): use SQL template casting for non-PK column types

Refactor type conversion for non-PK columns to use SQL template casting ($n::typename) instead of per-value SPI_execute_with_args("SELECT $1::typename") calls. This matches the pattern already used for primary key columns.

Changes:
  - sql_postgresql.c: Add format_type() lookup and $n::coltype casting to SQL_BUILD_UPSERT_PK_AND_COL for non-PK column values
  - cloudsync_postgresql.c: Simplify cloudsync_decode_bytea_to_pgvalue() to return base types only (INT8, FLOAT8, TEXT, BYTEA) without SPI casting
  - cloudsync_postgresql.c: Remove lookup_column_type_oid() function
  - Add test 19 (19_uuid_pk_with_unmapped_cols.sql) covering UUID PK with unmapped non-PK types (JSONB, UUID, INET, CIDR) and all CRUD operations: INSERT, UPDATE non-PK, UPDATE mapped cols, DELETE, RESURRECT, UPDATE PK

Performance benefit: Eliminates one SPI_execute call per non-PK column value during payload application, reducing overhead for unmapped PostgreSQL types.

* test(postgres): new tests

feat: add support for UUID primary keys in PG (#3)

* Fix for PG UUID used as PK

* build(postgres): update test target for the current test files

* docs(docs/postgresql/CLIENT.md): clarify primary key requirements for PostgreSQL and SQLite, added support for UUID primary keys

* test(claude): add custom command for claude code to run sqlite-to-pg tests for the specified table schema

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Co-authored-by: Marco Bambini <[email protected]>

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