feat: Added count filter

[danieljbruce]

With this pull request we can use the client to do a query filter based on the COUNT filter which we intend to support.

[conventional-commit-lint-gcf[bot]]

🤖 I detect that the PR title and the commit message differ and there's only one commit. To use the PR title for the commit history, you can use Github's automerge feature with squashing, or use automerge label. Good luck human!

-- conventional-commit-lint bot https://conventionalcommits.org/

[danieljbruce]

Having done this, I don't think this is right... I think we want to leverage the aggregateValue. More research is needed here...

[danieljbruce]

This PR is no longer relevant. COUNT is an aggregate method.