Infer NetworkController RPC endpoint types from URLs

[mcmire]

Explanation

NetworkController previously required callers and persisted state to include an RPC endpoint type. This change makes the type derived from the endpoint URL instead. Infura URLs matching the controller project ID or {infuraProjectId} are normalized to infura; all other URLs are normalized to custom.

The normalization runs for initial state, addNetwork, and updateNetwork, so existing state is corrected on the next initialization and mutation validation/client registration use the normalized endpoint shape. Infura network client IDs can also be derived from the URL when an inferred Infura endpoint does not provide one. The endpoint URL type is widened to support dynamically configured Infura subdomains.

References

None.

Checklist

• I've updated the test suite for new or updated code as appropriate
• I've updated documentation (JSDoc, Markdown, etc.) for new or updated code as appropriate
• I've communicated my changes to consumers by updating changelogs for packages I've changed
• I've introduced breaking changes in this PR and have prepared draft pull requests for clients and consumer packages to resolve them