2.11.4 - Add Postgres support for nested subpath (JSON) expressions

This patch was authored and released by @gwynne.

Implements SQLKit's new SQLDialect.nestedSubpathExpression(in:for:) method. #246

Remove the temporary workaround for PSQLError descriptions

This patch was authored and released by @gwynne.

The workaround didn't work very well anyway (I got it slightly wrong), and thanks to vapor/postgres-nio#372 is no longer needed at all.

This reverts #244, commit 875e8c1.

Temporary bandaid workaround for lack of PSQLError usefulness

This patch was authored and released by @gwynne.

This is a temporary workaround while waiting for vapor/postgres-nio#360 to be finished.

Add workaround for decoding `NUMERIC` as `Double`

This patch was authored and released by @gwynne.

The PostgresData implementation allowed this, and it's a halfway reasonable code path, so support it at the driver level.

Remove all use of deprecated PostgresNIO APIs

This patch was authored and released by @gwynne.

This is a major cleanup pass that deprecates PostgresDataEncoder, PostgresDataDecoder, and PostgresConfiguration in favor of working with the newer, better-designed APIs now available from PostgresNIO. As a side effect of this work, the minimum Swift version has been bumped to 5.7.

Every effort has been made to maintain backwards-compatible behavior whenever possible.

Require PostgresNIO 1.14.2 for CVE-2023-31136 fix

This patch was authored and released by @gwynne.

Update min Swift version to 5.6 and make platform versions consistent

This patch was authored and released by @gwynne.

Update to match FluentKit's declared version minimums

This patch was authored and released by @gwynne.

This should help fix building in Xcode.

Update minimum Swift version to 5.5

This patch was authored and released by @gwynne.

This space boringly left blank.

Revise PostgresDataEncoder implementation to better handle various Codable conformances

This patch was authored and released by @gwynne.

This avoids unconditional fatalError()s firing for various legal Encodable uses.