Rename PSQLRowSequence to PostgresRowSequence

[fabianfett]

Motivation

Same as #224 and #225.

Changes

• Rename PSQLRowSequence to PostgresRowSequence

[codecov-commenter]

Codecov Report

Merging #226 (6bc37e6) into main (3d5d25f) will increase coverage by 4.08%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #226      +/-   ##
==========================================
+ Coverage   39.10%   43.19%   +4.08%     
==========================================
  Files         121      121              
  Lines        9315     9322       +7     
==========================================
+ Hits         3643     4027     +384     
+ Misses       5672     5295     -377     

Flag	Coverage Δ
unittests	43.19% <100.00%> (+4.08%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
Sources/PostgresNIO/New/PSQLRowStream.swift	84.54% <100.00%> (+6.96%)	⬆️
Sources/PostgresNIO/New/PostgresRowSequence.swift	89.73% <100.00%> (ø)
...s/PostgresNIO/New/Data/Array+PostgresCodable.swift	94.68% <0.00%> (+1.06%)	⬆️
...rces/PostgresNIO/New/Extensions/Logging+PSQL.swift	19.60% <0.00%> (+1.42%)	⬆️
Sources/PostgresNIO/New/PSQLConnection.swift	30.00% <0.00%> (+2.10%)	⬆️
...s/PostgresNIO/Message/PostgresMessageDecoder.swift	95.45% <0.00%> (+2.27%)	⬆️
...es/PostgresNIO/New/PSQLBackendMessageDecoder.swift	93.28% <0.00%> (+2.98%)	⬆️
...urces/PostgresNIO/New/Messages/ErrorResponse.swift	32.30% <0.00%> (+3.07%)	⬆️
Sources/PostgresNIO/New/PostgresCell.swift	96.77% <0.00%> (+3.22%)	⬆️
...s/PostgresNIO/New/Data/Float+PostgresCodable.swift	76.66% <0.00%> (+3.33%)	⬆️
... and 22 more

[gwynne]

<no review message was provided; only a disturbance, as if a thousand repetitions of a sequence of letters suddenly cried out in terror and were shoved into a pull request...>

(Don't look at me like that, I've been awake long enough to keep making silly jokes in PR reviews in the first place, it wouldn't be any fun if they were good jokes 😅 Besides, they're good PRs; the work getting done is phenomenal ❤️.)