Bump SwiftNIO dependency (vapor#184)

Fix NIOSSL deprecation warnings

- Package.swift had the `NIOSSL` package raised to 2.14.1 from the previous 2.12.0.
- All instances of `TLSConfiguration.forClient` have been replaced with `TLSConfiguration.makeClientConfiguration`

Co-authored-by: Fabian Fett <fabianfett@apple.com>

Support AWS Redshift queries - SELECT Metadata without row number (va…

…por#167)

- Allow only one part in metadata response (Support AWS Redshift)

Co-authored-by: Fabian Fett <fabianfett@apple.com>

Ignore errors when closing the connection (vapor#151)

Fixes an issue where empty values were treated as null values and vic…

…a versa (vapor#144)

State machine (vapor#135)

* Adds PSQLFrontendMessage & PSQLBackendMessage

* State machine

* Removed Xcode headers.

* Apply suggestions from code review

Co-authored-by: Gwynne Raskind <gwynne@darkrainfall.org>

* Code review

* Apply suggestions from code review

Co-authored-by: Gwynne Raskind <gwynne@darkrainfall.org>

* Code review

* Apply suggestions from code review

Co-authored-by: Gwynne Raskind <gwynne@darkrainfall.org>

* Code review

* Add rudementary sasl support

* Update Sources/PostgresNIO/Connection/PostgresConnection+Notifications.swift

Co-authored-by: Gwynne Raskind <gwynne@darkrainfall.org>

* Code review

* Code review

* A little more error handling

* Error handling

* Better logging

* Fixes!

* Some better state handling when closing

* State machine tests

* Better cleanup in error states

* Cherry pick to be reverted.

* PreparedStatementStateMachine tests

* Code review

* Enable trace logging to better find the flaky tests

* PSQLChannelHandler logging + cleanup

* PR review

* Code review

* Update Sources/PostgresNIO/New/Connection State Machine/AuthenticationStateMachine.swift

Co-authored-by: Gwynne Raskind <gwynne@darkrainfall.org>

* Last code comment

* Last code comment fix

Co-authored-by: Gwynne Raskind <gwynne@darkrainfall.org>

Make PostgresNIO tests non throwing (vapor#141)

Remove unintended SASL print statement (vapor#139)

Support for SCRAM-SHA-256 SASL authentication (vapor#89)

* Add protocol awareness and encode/decode for authentication message types 10 (SASL mechanisms), 11 (SASL continue), and 12 (SASL final). Add more specific errors for types 2(Kerberos), 7(GSSAPI), 8(GSSAPI), 9(SSPI), and 6(obsolete SCM).

* Add generic SASL authentication management class with pluggable (via generics) SASL mechanism implementations.

* A mostly complete, if very, VERY messy, implementation of SCRAM-SHA-256 and SCRAM-SHA-256-PLUS per RFC 7677 et al. Things that are still missing: Channel binding support (Postgres DOES use this), authorization names (Postgres does not use these), proper username and password normalization, RFC-compliant validation of nonces, and determining whether the Hi() function can be replaced with PBKDF2

* Extend PostgresConnection to use SCRAM-SHA-256 negotiation when offered.

* Heavily update test matrix. Leave several of the Swift version/OS combos disabled to cut down on the excessive number of checks generated by the test matrices (72 instead of 234).

Close connection if requestTLS fails (vapor#134)

* Close connection if requestTLS fails

* Add test to ensure we don't hit assert from leaking connection