refactor: remove R type arg on `DbOption` #1056

Job	Run time
Rust exmaples	3m 27s
Rust benchmark	0s
Rust project check (ubuntu-latest)	4m 57s
Rust project check (macos-latest)	6m 6s
Rust project check (windows-latest)	12m 28s
Rust fmt	25s
	27m 23s

Provide feedback