Adopt file manager

[benoit74]

Rationale

Fix #104

Changes

• replace log.warn (deprecated) by log.warning
• add new FileManagerInputGenerator to support file-manager logs
• add x-tfm-files-added and x-tfm-files-deleted to log data (so that it is parsed automatically / asap)
• create new CountInput base class which is an input with a count of items, and the associated CountCounterRecorder which is summing the count of all inputs, instead of just increasing a counter by 1 for each input received
• modify the SharedFilesOperations indicator to use new CountCounterRecorder
• modify the SharedFilesOperation input to inherit the new CountInput base class
• adapt the dev docker-compose configuration to use file-manager instead of EduPi

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (5a1ddb3) 100.00% compared to head (0fe333f) 100.00%.

:exclamation: Current head 0fe333f differs from pull request most recent head f1fba4e. Consider uploading reports for the commit f1fba4e to get more accurate results

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #105 +/- ## ========================================= Coverage 100.00% 100.00% ========================================= Files 37 37 Lines 1100 1135 +35 Branches 204 212 +8 ========================================= + Hits 1100 1135 +35 ```

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