Page script should not try executing service worker code

[alanhamlett]

browser-wakatime/src/wakatimeScript.ts

Line 60 in 7d4fb6b

await WakaTimeCore.recordHeartbeat(projectDetails);

The page script needs to post a message to the service worker instead of directly calling code meant to only run in the background with access to the Chrome extension api.

To fix this, send a message to the service worker with the current page's DesignProject info as JSON. Listen for that message in the service worker, save the DesignProject data and re-use it for all future heartbeats sent for the current tab.

[jvelezpo]

#230