[vtctl] command deprecations

[ajm188]

Description

This PR adds fields to the command struct to support more formalized deprecation of commands. Unfortunately this required me to update every single command, because we weren't using keyed structs, but that is now fixed as well.

Examples:

I1008 18:54:55.783596   28685 main.go:67] I1008 22:54:55.782820 tablet_executor.go:277] Received DDL request. strategy=direct
I1008 18:54:56.177633   28685 main.go:67] I1008 22:54:56.177359 tablet_executor.go:277] Received DDL request. strategy=direct
I1008 18:54:56.784269   28685 main.go:67] I1008 22:54:56.784065 tablet_executor.go:277] Received DDL request. strategy=direct
New VSchema object:
{
  "tables": {
    "corder": {},
    "customer": {},
    "product": {}
  }
}
If this is not what you expected, check the input data (as JSON parsing will skip unexpected fields).
Waiting for vtgate to be up...
vtgate is up!
Access vtgate at http://SFO-M-AMASON02:15001/debug/status
❯ vtctlclient -server ":15999" help | grep DEPR
  InitTablet DEPRECATED [-allow_update] [-allow_different_shard] [-allow_master_override] [-parent] [-db_name_override=<db name>] [-hostname=<hostname>] [-mysql_port=<port>] [-port=<port>] [-grpc_port=<port>] [-tags=tag1:value1,tag2:value2] -keyspace=<keyspace> -shard=<shard> <tablet alias> <tablet type>
  (DEPRECATED) UpdateTabletAddrs [-hostname <hostname>] [-ip-addr <ip addr>] [-mysql-port <mysql port>] [-vt-port <vt port>] [-grpc-port <grpc port>] <tablet alias> 
  (DEPRECATED) SetShardIsMasterServing <keyspace/shard> <is_master_serving>
  (DEPRECATED) InitShardMaster [-force] [-wait_replicas_timeout=<duration>] <keyspace/shard> <tablet alias>
  CreateLookupVindex [-cell=<source_cells> DEPRECATED] [-cells=<source_cells>] [-tablet_types=<source_tablet_types>] <keyspace> <json_spec>
  (DEPRECATED) SplitClone <keyspace> <from_shards> <to_shards>
  (DEPRECATED) VerticalSplitClone <from_keyspace> <to_keyspace> <tables>
❯ vtctlclient -server ":15999" InitShardMaster -h
WARNING: InitShardMaster is deprecated and will be removed in a future release. Use InitShardPrimary instead.
Usage: InitShardMaster [-force] [-wait_replicas_timeout=<duration>] <keyspace/shard> <tablet alias>

DEPRECATED. Use InitShardPrimary instead.

  -force
        will force the reparent even if the provided tablet is not writable or the shard primary
  -wait_replicas_timeout duration
        time to wait for replicas to catch up in reparenting (default 30s)
❯ ./401_teardown.sh
Stopping vtgate...
Shutting down tablet zone1-100
Shutting down mysql zone1-100
Shutting down tablet zone1-101
Shutting down mysql zone1-101
Shutting down tablet zone1-102
Shutting down mysql zone1-102
Stopping vtctld...
Stopping etcd...
All good! It looks like every process has shut down

Related Issue(s)

Fixes #8953.

Checklist

• Should this PR be backported? no
• Tests were added or are not required n/a
• Documentation was added or is not required

Deployment Notes

[doeg]

The end-result is so readable!

[deepthi]

This is great!
Approving pre-emptively, I do think @doeg's comment needs to be addressed before we merge this.
Can you think of a reason why we should not port this to 12.0 before releasing it?

[ajm188]

I do think @doeg's comment needs to be addressed before we merge this.

Agreed, and done.

Can you think of a reason why we should not port this to 12.0 before releasing it?

Nope, I will port it over there as well!