feat: add alias and domain counts to respective admin pages

[shaunwarman]

• Add alias counts to domain admin page
• Add domain counts to user admin page

Checklist

• [X] I have ensured my pull request is not behind the main or master branch of the original repository.
• [X] I have rebased all commits where necessary so that reviewing this pull request can be done without having to merge it first.
• [X] I have written a commit message that passes commitlint linting.
• [X] I have ensured that my code changes pass linting tests.
• [X] I have ensured that my code changes pass unit tests.
• [X] I have described my pull request and the reasons for code changes along with context if necessary.