fix(NODE-5765): change type for countDocuments

[pashok88895]

Description

Is this intentional or just a bug?

What is changing?

Is there new documentation needed for these changes?

What is the motivation for this change?

Release Highlight

countDocuments now types the filter using the collection Schema

Previously, countDocuments had a weakly typed Document type for the filter allowing any JS object as input. The filter is now typed as Filter<Schema> to enable autocompletion, and, hopefully, catch minor bugs.

Thank you to @pashok88895 for contributing to this improvement.

Double check the following

• Ran npm run check:lint script
• Self-review completed using the steps outlined here
• PR title follows the correct format: type(NODE-xxxx)[!]: description
  • Example: feat(NODE-1234)!: rewriting everything in coffeescript
• Changes are covered by tests
• New TODOs have a related JIRA ticket

[alenakhineika]

@pashok88895 thank you for contributing! ✨