## Description
Extend the kopia metrics to include the snapshot's TotalFileSize parameter. This value also gets used as the metric for BytesWritten at the end of a
backup.
## Type of change
- [x] 🌻 Feature
## Issue(s)
* #894
## Test Plan
- [x] ⚡ Unit test
- [x] 💚 E2E
## Description
1/ introduce an ID() method int the account
package which provides the tenantID of the
configured account provider.
2/ introduce a event bus mock for testing.
## Type of change
- [x] 🌻 Feature
## Issue(s)
* #741
## Test Plan
- [x] ⚡ Unit test
## Description
Adds events for repo init, backup start and end,
and restore start and end. Not all expected
values are available. TODOs have been marked
for values that need future implementation.
## Type of change
- [x] 🌻 Feature
## Issue(s)
* #741
## Test Plan
- [x] ⚡ Unit test
