fix: watch attributes only run getters/setters for the method they define

[anatolzak]

closes #578

[netlify]

✅ Deploy Preview for electrodb-dev canceled.

Name	Link
🔨 Latest commit	ed72f88
🔍 Latest deploy log	https://app.netlify.com/projects/electrodb-dev/deploys/6a24429de6671100078fb0da

[anatolzak]

@tywalch Could you please take a brief look at this? the tldr is when applying attribute mutations for watchers, we now check the watch translations for each method (get versus set) to avoid triggering watcher logic for a method that the attribute doesn't define. During a read get, a watcher that only has a set (the most common case, such as an updatedAt timestamp) is not treated as a watcher at all. Therefore, it is neither force evaluated nor leaked into the result as undefined