Draft: Removals for v2

[fabianfett]

This is a quick and dirty draft of the removals that we want to do for v2. Happy to split this into smaller prs (see commits).

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 59.81308% with 43 lines in your changes missing coverage. Please review.

Project coverage is 71.92%. Comparing base (d6b6487) to head (7937b2f).

Files with missing lines	Patch %	Lines
Sources/PostgresNIO/PostgresQueryMetadata.swift	63.33%	11 Missing ⚠️
Sources/PostgresNIO/New/PostgresError.swift	65.00%	7 Missing ⚠️
Sources/PostgresNIO/Pool/PostgresClient.swift	0.00%	7 Missing ⚠️
...es/PostgresNIO/Connection/PostgresConnection.swift	45.45%	6 Missing ⚠️
...w/Connection State Machine/CloseStateMachine.swift	0.00%	3 Missing ⚠️
...nection State Machine/ConnectionStateMachine.swift	70.00%	3 Missing ⚠️
...urces/PostgresNIO/New/PostgresChannelHandler.swift	78.57%	3 Missing ⚠️
...ion State Machine/AuthenticationStateMachine.swift	66.66%	1 Missing ⚠️
Sources/PostgresNIO/New/NotificationListener.swift	0.00%	1 Missing ⚠️
...tgresNIO/Utilities/SASLAuthenticationManager.swift	66.66%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##             main     #445       +/-   ##
===========================================
+ Coverage   61.75%   71.92%   +10.17%     
===========================================
  Files         125       75       -50     
  Lines       10089     8473     -1616     
===========================================
- Hits         6230     6094      -136     
+ Misses       3859     2379     -1480     

Files with missing lines	Coverage Δ
.../Connection/PostgresConnection+Configuration.swift	51.35% <ø> (ø)
Sources/PostgresNIO/Data/PostgresDataType.swift	54.92% <ø> (-0.26%)	⬇️
Sources/PostgresNIO/Data/PostgresNumeric.swift	77.90% <ø> (ø)
Sources/PostgresNIO/Data/PostgresRow.swift	70.27% <ø> (+21.82%)	⬆️
...tion State Machine/ExtendedQueryStateMachine.swift	79.51% <100.00%> (ø)
... State Machine/PreparedStatementStateMachine.swift	91.83% <100.00%> (ø)
Sources/PostgresNIO/New/PSQLEventsHandler.swift	75.00% <ø> (ø)
Sources/PostgresNIO/New/PSQLTask.swift	77.77% <100.00%> (ø)
Sources/PostgresNIO/New/PostgresQuery.swift	69.67% <ø> (+0.35%)	⬆️
Sources/PostgresNIO/Utilities/NIOUtils.swift	0.00% <ø> (ø)
... and 11 more

... and 3 files with indirect coverage changes