Implement text array format

[jaggederest]

This adds roundtrip support for text and binary arrays containing a few sub-data-type formats, reusing the parser for other data types recursively inside the array parser. Has some SQL tests, tried to keep it relatively self-contained

[codecov]

Codecov Report

❌ Patch coverage is 92.40506% with 78 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
pgdog-postgres-types/src/array.rs	94.44%	35 Missing ⚠️
pgdog-postgres-types/src/datum.rs	67.85%	27 Missing ⚠️
pgdog-postgres-types/src/interval.rs	94.44%	10 Missing ⚠️
pgdog-postgres-types/src/smallint.rs	75.00%	3 Missing ⚠️
pgdog/src/backend/pool/connection/aggregate.rs	98.05%	2 Missing ⚠️
pgdog/src/net/messages/data_row.rs	94.11%	1 Missing ⚠️

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[levkk]

very cool