Add usage statistics for applications to improve search results and update Cargo.lock

[AnyTimeTraveler]

I added a small module, which allows anyrun to keep track of how often an entry has been launched.
Anyrun can then use these statistics to improve the search ranking of these applications.

There the applications plugin has gained the following configuration options:

use_usage_statistics: bool
/// Whether to put more often used applications higher in the search rankings (default: true)

usage_score_multiplier: i64
/// How much score to add for every usage of an application (default: 50)
/// As a reference: Each matching letter is 25 points


max_counted_usages: i64
/// Maximum amount of usages to count (default: 10)
/// This is to limit the added score, so often used apps don't get too big of a boost

Since I see no downside to this, I have chosen to enable this feature by default.

Please let me know, if you'd like me to make any changes.

[AnyTimeTraveler]

This PR mirrors this one: anyrun-org/anyrun#176

The only change is the file paths and that the example config has been moved to the Readme.