Final Cleanup for v3

[RHammond2]

This is the final cleanup for take care of the last remaining threads in the issues.

Closes #125

• Any remaining constant is not one that should ever be changed, but is created at the top of the module if it's commonly used.

Closes #229

• There is not a formal means through which a schema is created, but all of the information required for a user to port their data to a compatible format and schema is abundantly documented.

Closes #214

• Much of the descriptions have been revisited to offer minor clarifications and reorganization to read more clearly, though more work could likely be done in the FY24/v3.1 scope of work, and should be considered there as a more specific listing of improvements.

[codecov-commenter]

Codecov Report

Attention: 49 lines in your changes are missing coverage. Please review.

Comparison is base (c721ef5) 65.76% compared to head (f91d942) 65.48%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## develop_v3 #255 +/- ## ============================================== - Coverage 65.76% 65.48% -0.28% ============================================== Files 29 29 Lines 4265 4358 +93 ============================================== + Hits 2805 2854 +49 - Misses 1460 1504 +44 ``` | [Files](https://app.codecov.io/gh/NREL/OpenOA/pull/255?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=NREL) | Coverage Δ | | |---|---|---| | [openoa/analysis/eya\_gap\_analysis.py](https://app.codecov.io/gh/NREL/OpenOA/pull/255?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=NREL#diff-b3Blbm9hL2FuYWx5c2lzL2V5YV9nYXBfYW5hbHlzaXMucHk=) | `95.16% <100.00%> (ø)` | | | [openoa/plant.py](https://app.codecov.io/gh/NREL/OpenOA/pull/255?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=NREL#diff-b3Blbm9hL3BsYW50LnB5) | `75.61% <100.00%> (+0.22%)` | :arrow_up: | | [openoa/schema/\_\_init\_\_.py](https://app.codecov.io/gh/NREL/OpenOA/pull/255?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=NREL#diff-b3Blbm9hL3NjaGVtYS9fX2luaXRfXy5weQ==) | `100.00% <ø> (ø)` | | | [openoa/utils/\_converters.py](https://app.codecov.io/gh/NREL/OpenOA/pull/255?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=NREL#diff-b3Blbm9hL3V0aWxzL19jb252ZXJ0ZXJzLnB5) | `93.91% <ø> (ø)` | | | [openoa/utils/filters.py](https://app.codecov.io/gh/NREL/OpenOA/pull/255?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=NREL#diff-b3Blbm9hL3V0aWxzL2ZpbHRlcnMucHk=) | `94.79% <ø> (-0.06%)` | :arrow_down: | | [openoa/utils/imputing.py](https://app.codecov.io/gh/NREL/OpenOA/pull/255?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=NREL#diff-b3Blbm9hL3V0aWxzL2ltcHV0aW5nLnB5) | `90.41% <ø> (ø)` | | | [openoa/utils/machine\_learning\_setup.py](https://app.codecov.io/gh/NREL/OpenOA/pull/255?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=NREL#diff-b3Blbm9hL3V0aWxzL21hY2hpbmVfbGVhcm5pbmdfc2V0dXAucHk=) | `79.24% <ø> (ø)` | | | [openoa/utils/met\_data\_processing.py](https://app.codecov.io/gh/NREL/OpenOA/pull/255?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=NREL#diff-b3Blbm9hL3V0aWxzL21ldF9kYXRhX3Byb2Nlc3NpbmcucHk=) | `86.51% <ø> (ø)` | | | [openoa/utils/qa.py](https://app.codecov.io/gh/NREL/OpenOA/pull/255?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=NREL#diff-b3Blbm9hL3V0aWxzL3FhLnB5) | `11.65% <ø> (ø)` | | | [openoa/utils/timeseries.py](https://app.codecov.io/gh/NREL/OpenOA/pull/255?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=NREL#diff-b3Blbm9hL3V0aWxzL3RpbWVzZXJpZXMucHk=) | `86.95% <ø> (ø)` | | | ... and [9 more](https://app.codecov.io/gh/NREL/OpenOA/pull/255?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=NREL) | |

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[RHammond2]

@jordanperr for #229 I think for me the ask is still a bit vague and not remotely possible if an analysis class requires a PlantData object for initialization, so if you could provide more details on the what then we might be able to get something in there, but as-is I would close it and request a new issue with more specifics. Similarly, the schema are provide through openoa.schema.metadata.ANALYSIS_REQUIREMENTS, so a user could just import that and use it as needed.

However, if we're thinking of enabling bringing a custom validation set, then that's maybe a separate idea, though, and would enable additional workflows like a user-defined analysis class/method, which is pretty useful for more customized analysis workflows.