chore: add offset-based pagination support to aibridge list endpoint (#20393)

Necessary for the frontend to be able to paginate easily. Cursor
pagination is good for fetching all events, but doesn't play very well
when a pagination component gets involved.

Adds support for `?offset=x` to the existing endpoint. The cursor-based
pagination (`?after_id=x`) is still supported. The two pagination modes
are mutually exclusive, and are documented as such. If both are
supplied, the request will be rejected.

Also adds a `total` property to the response that contains the full
count of items matching the filter. We already have indices in place so
I don't think this will impact performance (or we can revisit it before
GA).

codersdk/aibridge.go

@@ -56,6 +56,7 @@ type AIBridgeToolUsage struct {
 }
 
 type AIBridgeListInterceptionsResponse struct {
+	Total   int64                  `json:"total"`
 	Results []AIBridgeInterception `json:"results"`
 }