The token parameter in /keys/query is not implemented anywhere

[dkasak]

Link to problem area: https://spec.matrix.org/v1.2/client-server-api/#post_matrixclientv3keysquery

Issue
/keys/query mentions a token parameter which has no known server implementations. Clients mostly do not implement it either. It was originally added in matrix-org/matrix-spec-proposals#1104 which doesn't give much of a rationale for the addition.

Expected behaviour
The parameter should probably be removed from the spec since right now it's just fiction. See https://matrix.to/#/!NasysSDfxKxZBzJJoE:matrix.org/$X9VPspM3NG82qIeZsuqcmYN8uF40_2PU8kISa48UFA0?via=matrix.org&via=libera.chat&via=element.io for a discussion and more context.