Add Flexibility to AI_Logger_Garbage_Collector via Filters

### Description

I would like to see additional values passed through WordPress filters in the AI_Logger_Garbage_Collector class so that I can fine tune when our logs are garbage collected, and how logs are queried during the garbage collection process.

Specifically, I would like to see a filter around the `$recurrence` parameter of the `wp_schedule_event` function, like so:

`apply_filters( 'ai_logger_garbage_collector_cron_interval', 'every_three_hours' )`

I would also like to see the return of the filter for the `$throttle` variable within the `run_cleanup` method:

`$throttle = boolval( apply_filters( 'ai_logger_garbage_collector_throttle', $throttle ) );`

Finally, I would like to see the post args array that is passed to the `get_posts` function passed through a filter:

`$post_args = apply_filters(
'ai_logger_garbage_collector_post_args',
[
'fields' => 'ids',
'ignore_sticky_posts' => true,
'post_type' => 'ai_log',
'posts_per_page' => $throttle ? 100 : 1000,
'suppress_filters' => false,
'update_post_meta_cache' => false,
'update_post_term_cache' => false,
'date_query' => [
[
'before' => "-{$max_age} days",
'column' => 'post_date',
],
],
]
);`

...

`$logs_to_delete = get_posts( // phpcs:ignore WordPressVIPMinimum.Functions.RestrictedFunctions.get_posts_get_posts
$post_args
);`

This last point is motivated by the fact that currently, all of our logs have a `post_status` value of `draft`. By default, if `post_status` is not included in the post args array, `get_posts` will only query for posts that have a `post_status` of `publish`. Therefore, none of our logs are being garbage collected.

### Use Case

Users will have a greater degree of freedom in determining how frequently their logs are garbage collected and how the logs to be garbage collected are queried.