Add config to silent notifications and always create new notes in notes_subdir

[TwIStOy]

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[epwalsh]

Hey @TwIStOy, thanks for the PR. I have a couple comments:

1. It's not clear to me based on the name of the option what setting never_current_dir does.
2. There's a lot of places where we call echo.info(..). Instead of wrapping all of those cases in an if not opts.silent block, maybe we could add the logic within echo module itself?

[TwIStOy]

Thanks for your review!

1. Move the option from config to config. completion and rename it to new_notes_location. Maybe the name is more clear?
2. In the echo module, it's hard to get the instance of obsidian.Client. So I try to pass the client as a parameter into echo.info, I think it's a little wired. If there's some better options, please let me know. I will update the pr.

[epwalsh]

Thanks @TwIStOy, I liked how you handled new_notes_location. For the echo module, I think it would make a little more sense to have a log_level setting instead of the silent option. And we could just pass log_level to echo.(debug|info|warn|error) instead of the client itself. How does that sound?

[TwIStOy]

Sounds good. Change silent option to log_level.

[epwalsh]

Looks great!