Merge updates in conventional wastewater configurations

[yalinli2]

@RaiSaumitra I'm making this a draft PR so we can discuss any needed updates, some of my changes could be style-related for easier understanding/improve in speed

[yalinli2]

@RaiSaumitra I took a quick look and added notes (I think you've started reviewing them so that's great). When @joyxyz1994 is back we should ask her to review before merging into the main branch.

The tests actually passed but something happened with Codecov (this is to check how much code is covered by the tests), not exactly sure why but maybe it's because it's a draft PR not an actual PR? I'll figure this out later.

Thanks!

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 29.18149% with 2189 lines in your changes missing coverage. Please review.

Project coverage is 66.97%. Comparing base (b973f6c) to head (0800ffd). Report is 14 commits behind head on main.

:exclamation: Current head 0800ffd differs from pull request most recent head 3db40fe

Please upload reports for the commit 3db40fe to get more accurate results.

Files	Patch %	Lines
qsdsan/sanunits/_junction_copy.py	11.01%	622 Missing :warning:
qsdsan/sanunits/_junction.py	2.76%	493 Missing :warning:
qsdsan/sanunits/_clarifier.py	43.29%	305 Missing and 12 partials :warning:
qsdsan/sanunits/_sludge_treatment.py	53.99%	233 Missing and 9 partials :warning:
qsdsan/sanunits/_membrane_gas_extraction.py	25.00%	162 Missing :warning:
qsdsan/sanunits/_activated_sludge_process.py	33.48%	145 Missing :warning:
qsdsan/processes/_adm1_p_extension.py	53.25%	115 Missing :warning:
qsdsan/utils/wwt_design.py	15.23%	89 Missing :warning:
qsdsan/_waste_stream.py	20.00%	3 Missing and 1 partial :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #103 +/- ## ========================================== - Coverage 74.18% 66.97% -7.22% ========================================== Files 91 95 +4 Lines 16054 19104 +3050 Branches 1686 1953 +267 ========================================== + Hits 11910 12794 +884 - Misses 3689 5837 +2148 - Partials 455 473 +18 ``` | [Flag](https://app.codecov.io/gh/QSD-Group/QSDsan/pull/103/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=QSD-Group) | Coverage Δ | | |---|---|---| | [unittests](https://app.codecov.io/gh/QSD-Group/QSDsan/pull/103/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=QSD-Group) | `66.97% <29.18%> (-7.22%)` | :arrow_down: | 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=QSD-Group#carryforward-flags-in-the-pull-request-comment) to find out more.

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[yalinli2]

@RaiSaumitra I resolved conflicts between metro and main, fixed some minor bugs in metro, and merged in main (see cb8a746)

I'll do this periodically in the future as I work on the BSM2 config, let me know if I messed anything on your system, thanks!

ps, the tests are failing due to some other issues and I'm trying to get those fixed

[yalinli2]

btw on the degradability and organic property of components, we should be consistent with the default (qsdsan/data/_components.tsv):

but @RaiSaumitra I think you set things differently (metroASM2d.py)

also, you don't have to use Component.from_chemical if you provide search_ID, i.e., you can just

     CO2 = qs.Component('S_CO2', search_ID='CO2', particle_size='Dissolved gas', degradability='Undegradable', organic=False)