Ouranosinc / xclim / 11217070145

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Heat wave magnitude indicator (#1926)

Closes #994 

### Pull Request Checklist:
- [x] This PR addresses an already opened issue (for bug fixes /
features)
    - This PR fixes #994 
- [x] Tests for the changes have been added (for bug fixes / features)
- [ ] (If applicable) Documentation has been added / updated (for bug
fixes / features)
- [x] CHANGELOG.rst has been updated (with summary of main changes)
- [x] Link to issue (:issue:`number`) and pull request (:pull:`number`)
has been added

### What kind of change does this PR introduce?
* Adds a heat_wave_magnitude indicator based on a variable definition on
heat waves (consecutive days of maximum temperature above a given
threshold), which yields the highest magnitude in the form of
accumulated maximum temperature differences above a threshold along a
consecutive heat wave
* Adds a windowed_max_run_sum function to indices.run_length which
yields the maximum accumulated values of runs per `freq` period
* Adds a rse (termed run sum encoding) function which sums positive
values for runs

### Does this PR introduce a breaking change?
No

### TODO:
- [x] one of the test doesn't convert units properly
- [x] french translation (need help with that one)

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