feat: export api

feat(typescript): add type declaration

Add TypeScript declaration file

feat: remove isBootstrapped from exports

feat(ssr): check defined document and window

fix(merge): use one level merge only

doc: copy change

fix(screenview): missing config hit (#191)

closes #178

feat(bootstrap): custom gtag.js url (#177)

feat(page-tracker): add pageTrackerSkipSamePath

closes #103

fix: page tracking

closes #163
closes #150