optimizely / javascript-sdk / 2963

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fix stubbing issues and prep for release 0.9.1 for datafile manager and event processor packages (#712)

## Summary
Upgrading to latest typescript version is causing stubbing issues and failing some unit tests. Downgrading the typescript version to `3.8.x` temporarily to fix this. Also updated the version of `logging` to `0.3.1` which downgrades typescript version in that package

## Test plan
- Manually tested thoroughly.
-  All existing tests pass

1026 of 1154 branches covered (88.91%)

Branch coverage included in aggregate %.

9186 of 9366 relevant lines covered (98.08%)

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