All processes return tuple(array) with array length equal to .

[gvegayon]

(This is the right PR :P)

This addresses and should close #142. The PR does the following:

• Corrects all classes in pyrenew.process to return tuples with arrays of shape (duration,).
• Makes n_timepoints optional for models under pyrenew.model. Only required when observed data is not passed, the length of the time series is inferred from the observed data.
• Consequently, updates tests and tutorials, only using the n_timepoints argument when simulating data.
• It also adds additional assertions to the process testing to make sure the length of the output matches duration.

Notice this PR will be merged in to #131.

cc @damonbayer and @dylanhmorris

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 93.33333% with 1 line in your changes missing coverage. Please review.

Project coverage is 92.63%. Comparing base (439367c) to head (e6d75dc).

Files	Patch %	Lines
...odel/src/pyrenew/model/rtinfectionsrenewalmodel.py	87.50%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## 8-state-level-unadjusted-rt #144 +/- ## =============================================================== + Coverage 92.48% 92.63% +0.14% =============================================================== Files 34 34 Lines 719 733 +14 =============================================================== + Hits 665 679 +14 Misses 54 54 ``` | [Flag](https://app.codecov.io/gh/CDCgov/multisignal-epi-inference/pull/144/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=CDCgov) | Coverage Δ | | |---|---|---| | [unittests](https://app.codecov.io/gh/CDCgov/multisignal-epi-inference/pull/144/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=CDCgov) | `92.63% <93.33%> (+0.14%)` | :arrow_up: | 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=CDCgov#carryforward-flags-in-the-pull-request-comment) to find out more.

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[gvegayon]

Codecov is now happy, @damonbayer and @dylanhmorris

[damonbayer]

Codecov is now happy, @damonbayer and @dylanhmorris

I think the tests I added are now redundant.

[gvegayon]

No redundant tests now, @dylanhmorris and @damonbayer.

[damonbayer]

Pinging @dylanhmorris for final review.