Access to a query-specific context value in ecs_order_by_action_t and/or ecs_sort_table_action_t

[KislyjKisel]

Describe the problem you are trying to solve.
Currently ecs_order_by_action_t is being called without any context value, making it harder to use with bindings.

Describe the solution you'd like
Extending ecs_query_desc_t with void *order_by_ctx; and ecs_ctx_free_t order_by_ctx_free; fields, with context being passed to order callbacks, similar to already existing void *group_by_ctx;.