SQL: Align class packages in sql-proto and shared-proto projects

[costin]

Looks like a left-over from the various class movements:

1. the package name of the sql-proto project is sql.plugin. This is incorrect and misleading since that's the package of the server. It should be changed to something more appropriate like sql.proto or (to avoid a cycle with 2 below) `sql.proto.action.

2. the package name of the shared-proto project is sql.proto. Due to 1 above, it should be sql.proto.shared or (since that creates a cycle between proto.shared and proto) to sql.shared.proto or sql.proto.common .

That is, the package name should properly convey the project name and the hierarchy (sql-proto depends on shared-proto not vice versa) without splitting an existing package name.

[elasticmachine]

Pinging @elastic/es-search-aggs

[imotov]

I think we can kill the word shared from the project names and package names. Basically we can

1. rename project sql-proto-> sql-action,
2. rename package sql.plugin to sql.action (while moving CliFormatter to sql.client.common)
3. rename project sql-shared-client -> sql-client
4. rename package sql.shard.client to sql.client
5. rename sql-shared-proto -> sql-proto (leave sql.proto there as is)

[costin]

+1
I would move CliFormatter either to sql.cli.common (since it's not used in other clients) or just leave it in sql.action for the time being.