[epic] catalogd web interface performance improvements

[grokspawn]

The RFC written for operator-framework/catalogd#426 identified a desire to formalize the catalogd web API, and divided work into a set of v1.0-blocking changes to enable versioned web interfaces (phase 1) and non-blocking changes to express and extend a formalized API specification (phase 2).

This epic is to capture the need to provide more performant FBC access APIs. Initial work captured here intended to provide for API discovery via an OpenAPI endpoint is split off to #1568.

Work here will be behind a feature gate.

• catalogd web api performance improvements RFC #1569
• implementing feature-gated, caching catalogd web query API #1603
• serve catalog content based on supplied parameters #1606
• catalogd web api benchmarking #1607

[grokspawn]

note: we have discrete api discovery and package discovery, but the original description conflates them. Clean up.

1. parametric query interface to drill down
   1. v1/query to start with
2. carve off API discovery (e.g. swagger endpoint discovery) to a separate v1.x-scoped epic.