feat: introduce data interfaces

[johngeorgewright]

Introduce ConfigurableData, InsertableData, and QueryableData.

[Copilot]

Pull request overview

Introduces a set of narrower Data-related interfaces (ConfigurableData, InsertableData, QueryableData) and updates the server/client layers to consume them, including a new endpoint + client method to fetch all matching payloads for a given name.

Changes:

• Added ConfigurableData, InsertableData, and QueryableData interfaces and refactored IData into an intersection of those interfaces.
• Updated Data and PromisedData to implement the new interfaces.
• Added GET /:name/all on the server and Client.getPayloads() on the client to retrieve all matching payloads for a name.

Reviewed changes

Copilot reviewed 9 out of 9 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
packages/server/src/index.ts	Adds GET /:name/all route to return all matching payloads for a specific payload name.
packages/client/src/index.ts	Makes Client implement QueryableData and adds getPayloads(); updates query typing for existing methods.
packages/api/src/ConfigurableData.ts	New interface for configuration-related methods (usePayload, useTargeting, useFallThroughTargeting).
packages/api/src/InsertableData.ts	New interface for insert-related method (insert).
packages/api/src/QueryableData.ts	New interface for query-related methods (getPayload, getPayloadForEachName, getPayloads).
packages/api/src/IData.ts	Replaces the old IData interface with an intersection type of the three new interfaces.
packages/api/src/Data.ts	Updates Data to implement the new interfaces (no functional behavior change intended).
packages/api/src/PromisedData.ts	Updates PromisedData to implement the new interfaces.
packages/api/src/index.ts	Re-exports the new interfaces from the public API entrypoint.