fix: Add blockTrackingForMe method

[mxdvl]

Hi and thanks for this library!

I’m looking at implementing a way to let visitors of my website deactivate tracking entirely, and discovered that the type definition for Fathom was incomplete. It lacks the blockTrackingForMe and enableTrackingForMe methods.

Here’s a proposal to add both of them and queue like the other methods. Note:

• I've kept the type dependent en the functions themselves.
• I have not added tests, but can do.

Information gathered from the docs and local testing.

[derrickreimer]

Thanks @mxdvl! Could you add exported function (similar to trackPageview) to proxy these calls to window.fathom (or push them onto the command queue)?

[derrickreimer]

Looking good! Thanks!

[derrickreimer]

Published https://github.com/derrickreimer/fathom-client/releases/tag/v3.3.0