Refactored top level name of the watcher function

[DavyLandman]

I noticed that Watcher.watch is a bit strange:

• watcher.watch looks a bit duplicate
• it doesn't actually start the watch, it's more of a builder pattern

alternatives:

• Watcher.path
• Watcher.on (but that was already the event handler)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 80.7%. Comparing base (231f003) to head (bc66975).
Report is 8 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##              main     #37   +/-   ##
=======================================
  Coverage     80.7%   80.7%           
  Complexity     135     135           
=======================================
  Files           16      16           
  Lines          570     570           
  Branches        66      66           
=======================================
  Hits           460     460           
  Misses          69      69           
  Partials        41      41           

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