Add new provider to Reactome record for Pathway Viewer

[github-actions[bot]]

Closes #1085

[codecov[bot]]

Codecov Report

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

Project coverage is 40.44%. Comparing base (9da7ad2) to head (0c410fa). Report is 24 commits behind head on main.

:exclamation: Current head 0c410fa differs from pull request most recent head 797b2bd. Consider uploading reports for the commit 797b2bd to get more accurate results

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #1086 +/- ## ========================================== - Coverage 40.55% 40.44% -0.12% ========================================== Files 150 150 Lines 8341 8340 -1 Branches 1929 1637 -292 ========================================== - Hits 3383 3373 -10 - Misses 4754 4776 +22 + Partials 204 191 -13 ```

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[cthoyt]

@sierra-moxon I just added a curation guide for providers in https://github.com/biopragmatics/bioregistry/blob/create-pull-request/patch-0178d13/docs/guides/providers.md. Can you take a look at this and tell me if it's sufficient to explain what's going on here?

@rombaum since you also recently curated some providers, your feedback would be helpful too. The goal is to get enough information in this page that someone new can read it and understand what to put where, and why

[sierra-moxon]

Makes sense, thanks!