Add command tips to COMMAND DOCS (#10104)

Adding command tips (see https://redis.io/topics/command-tips) to commands.

Breaking changes:
1. Removed the "random" and "sort_for_script" flags. They are now command tips.
(this isn't affecting redis behavior since #9812, but could affect some client applications
that's relying on COMMAND command flags)

Summary of changes:
1. add BLOCKING flag (new flag) for all commands that could block. The ACL category with
  the same name is now implicit.
2. move RANDOM flag to a `nondeterministic_output` tip
3. move SORT_FOR_SCRIPT flag to `nondeterministic_output_order` tip
3. add REQUEST_POLICY and RESPONSE_POLICY where appropriate as documented in the tips
4. deprecate (ignore) the `random` flag for RM_CreateCommand

Other notes:
1. Proxies need to send `RANDOMKEY` to all shards and then select one key randomly.
  The other option is to pick a random shard and transfer `RANDOMKEY `to it, but that scheme
  fails if this specific shard is empty
2. Remove CMD_RANDOM from `XACK` (i.e. XACK does not have RANDOM_OUTPUT)
   It was added in 9e4fb96ca12476b1c7468b143efca86b478bfb4a, I guess by mistake.
   Also from `(P)EXPIRETIME` (new command, was flagged "random" by mistake).
3. Add `nondeterministic_output` to `OBJECT ENCODING` (for the same reason `XTRIM` has it:
   the reply may differ depending on the internal representation in memory)
4. RANDOM on `HGETALL` was wrong (there due to a limitation of the old script sorting logic), now
  it's `nondeterministic_output_order`
5. Unrelated: Hide CMD_PROTECTED from COMMAND