Breaking changes for v5 #1646

This issue contains a list of changes I would like to make, but require breaking changes to the API. Most of these will not affect the majority of users, but still require a major version bump.

• Relay connections should error instead of silently clamping page sizes to maxSize. Today, requesting first: 400 on a connection with the default maxSize of 100 returns 100 nodes with hasNextPage: true and no error, so consumers only discover the cap by experimentation (this bit a real API consumer recently — after testing against production they documented the API as "every connection truncates at 100 no matter what first asks for"). In the next major, requesting a page larger than maxSize should throw a validation/user-input error. This applies to the relay plugin's connection helpers and everything built on them (prisma/drizzle plugin connections). We should keep (or add) an option to opt back into the clamping behavior for anyone relying on it.