Feature/postprocess otf lists

Pull request checklist

Please check if your PR fulfills the following requirements:

[ ] Make sure you are requesting to pull a topic/feature/bugfix branch (right side). Don't request your master!
[ ] Make sure you are making a pull request against the develop branch (left side). Also you should start your branch off our develop.
[ ] Check the commit's or even all commits' message styles matches our requested structure.
[ ] Check your code additions will fail neither code linting checks nor unit test.

Pull request type

Please check the type of change your PR introduces: - [ ] Bugfix - [x] Feature - [ ] Code style update (formatting, renaming) - [ ] Refactoring (no functional changes, no api changes) - [ ] Build related changes - [ ] Documentation content changes - [ ] Other (please describe): ## What is the new behavior?

Add aggregation step

Does this introduce a breaking change?

[ ] Yes
[x] No

Other information

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Codecov Report

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

Project coverage is 94.52%. Comparing base (3f6c023) to head (310ce3e). Report is 1 commits behind head on feature/otf_lists.

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## feature/otf_lists #85 +/- ## ================================================== Coverage 94.52% 94.52% ================================================== Files 19 19 Lines 1261 1261 ================================================== Hits 1192 1192 Misses 69 69 ``` | [Flag](https://app.codecov.io/gh/wri/gfw-raster-analysis-lambda/pull/85/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=wri) | Coverage Δ | | |---|---|---| | [unittests](https://app.codecov.io/gh/wri/gfw-raster-analysis-lambda/pull/85/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=wri) | `94.52% <ø> (ø)` | | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=wri#carryforward-flags-in-the-pull-request-comment) to find out more.

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wri / gfw-raster-analysis-lambda