Abin Simon 784db9e12e
Speed up Exchange backup by parallelizing url fetch (#1608)
## Description

From rough numbers we can speedup an account with ~3000 emails, ~1000 contacts and ~1000 events from ~18m to <3m.

## Type of change

<!--- Please check the type of change your PR introduces: --->
- [ ] 🌻 Feature
- [ ] 🐛 Bugfix
- [ ] 🗺️ Documentation
- [ ] 🤖 Test
- [ ] 💻 CI/Deployment
- [ ] 🐹 Trivial/Minor

## Issue(s)

<!-- Can reference multiple issues. Use one of the following "magic words" - "closes, fixes" to auto-close the Github issue. -->
* https://github.com/alcionai/corso/issues/362
* https://github.com/alcionai/corso/issues/1595
* https://github.com/alcionai/corso/pull/1607

## Test Plan

<!-- How will this be tested prior to merging.-->
- [ ] 💪 Manual
- [x]  Unit test
- [x] 💚 E2E
2022-12-01 04:46:24 +00:00
..