ThePalaceProject / web-patron / 24477785350

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Dynamic runtime registry fetch support (PP-3114) (#118)

## Description

- Changes library setup for libraries configured via `libraries:
<url-string>` (deprecated) and `registries[].url` to occur at runtime
(e.g., `npm run start`), rather than at build time.
- Adds support and optimizations for crawlable paginated library
registry feeds, when configured and when required `order=modified` sort
facet is advertised.
- Creates hooks for computing and validating slugs.

## Motivation and Context

Improves service start up performance by instantiating library pages
during runtime, rather than build time. Our deployment currently builds
the app in a docker container, which could not complete startup until
the build was finished.

Improves runtime performance by incrementally loading updated registry
libraries during refresh, reducing the load on each instance and on the
configured registries.

Lays groundwork for future registry improvements.

[Jira PP-3114]

## How Has This Been Tested?

- Manual testing in local dev environment.
- Checks (tests, type checking, linter) pass locally.
- CI tests pass.

## Checklist:

- [x] I have updated the documentation accordingly.
- [x] All new and existing tests passed.

142 of 164 branches covered (86.59%)

Branch coverage included in aggregate %.

119 of 121 new or added lines in 6 files covered. (98.35%)

235 of 256 relevant lines covered (91.8%)

12.69 hits per line