Convert @bugsnag/core/src/lib/feature-flag-delegate to TypeScript#2459

gingerbenw merged 2 commits intointegration/typescriptbugsnag/bugsnag-js:integration/typescriptfrom

PLAT-13690-feature-flag-delegatebugsnag/bugsnag-js:PLAT-13690-feature-flag-delegateCopy head branch name to clipboard