Generate `InstrumentationEvent::BeginTransaction` for custom transaction SQL #4788

Job	Run time
Compiletests	1m 16s
Check rustfmt style && run clippy	35s
Check sqlite bundled + Sqlite with asan	4m 59s
Check mysql bundled + Mysql with asan	18m 34s
Check Minimal supported rust version (1.78.0)	1m 56s
Check postgres bundled + Postgres with asan	9m 28s
Spell Check with Typos	3s
Check	0s
	36m 51s

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