Ouranosinc / xclim / 11243240574

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Create _streamflow_flow_indices.py (#1832)

streamflow_flow_indice is a submodule in the xclim indices module to
calculate streamflow signatures, representing individual watershed
characteristics of large river/lake basins.

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### Pull Request Checklist:
- [x] This PR addresses an already opened issue (for bug fixes /
features)
    - This PR fixes #xyz
- [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)
- [ ] Link to issue (:issue:`number`) and pull request (:pull:`number`)
has been added

### What kind of change does this PR introduce?

* ...This PR introduces three hydrological signatures in xclim indices
module. The functions included are to calculate the high and low flow
variables of a data series of watersheds and generate a characteristic
value of the catchment from the calculated hydrological signatures.

### Does this PR introduce a breaking change?
This can develop unique watershed attributes.
### Other information:

33 of 33 new or added lines in 2 files covered. (100.0%)

9243 of 10331 relevant lines covered (89.47%)

7.56 hits per line