normalize async API surface over all TFMs (#2144)

* - normalize async API surface over all TFMs (fix #2143)
- target net8.0 instead of net5.0
- lib updates

* net9 SDK

* perf tests: clean up SqlClient warning

* CI fix: test concurrency

* rev snowflake

Update Readme.md

(actually just to bump build)

revert #2050 - see #2049 for more details (#2070)

* revert #2050 - see #2049 for more details

implement DateOnly/TimeOnly (#2051)

fix #1715
adds net6 TFM

add REVERT to CommandText checklist (#2048)

fix codegen error in value-type multimap #2005 (#2022)

in horizontal multi-map, don't "returnValueLocal = null" for value-types (invalid IL)
fix #2005

1. give clearer error messages when an ICustomQueryParameter is null (#…

…2003)

2. provide a convenience .ctor on DbString

fix #1993 - when matching properties, prefer non-normalized property …

…name (#1997)

whitespace for auto-SP detection: use unicode spec via regex (#1987)

* add fix and test for #1975

* wrong ticket number; is #1986

NRT tweak on GetConstructorParameter