transport: QueryInfo contents inaccessible outside of transport

[Kulezi]

QueryInfo contains only unexported fields:

// QueryInfo represents data required for host selection policy to create query plan.
// Token and strategy are only necessary for token aware policies.
type QueryInfo struct {
	tokenAware bool
	token      Token
	topology   *topology
	strategy   strategy
	offset     uint64 // For round robin strategies.
}

This creates a problem that its impossible to create a custom HostSelectionPolicy outside of transport package that would make any use of QueryInfo

[Kulezi]

Also wouldn't QueryInfo benefit from holding keyspace (which has a strategy) instead of strategy?