Tonbo should create folder

[paahaad]

#264
Tonbo should automatically create db folder

[codecov]

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[crwen]

Sorry for the late response. I think the main problem is in DbOption. The path must exists when creating a Path, so it does not work even though we create the directory when building db.

let options = DbOption::new(
    Path::from_filesystem_path("./db_path/users").unwrap(), // path must exists here
    &UserSchema,
);

let db = DB::new(options, TokioExecutor::current(), UserSchema)
    .await
    .unwrap();