Support theia commands to get diagnostic infos about Clickhouse DB/Spark

[yuntanghsu]

Describe what you are trying to solve:

Currently, if we want to acquire metrics from Clickhouse database, we need to go to each shards (clickhouse cluster) to send queries to get the infos we need, which is time consuming.

Describe the solution you have in mind
:

Using CLI to directly send built-in queries to retrieve metrics from Clickhouse database.

Describe how your solution impacts user flows
:

User can acquire the basic infos (storage usage, table infos, current insertion rate) for each shards.
User can choose whether to print the 2-d array or print the returned metrics by using --print-table flag

For example, when user type
theia get clickhouse --diskInfo --print-table

Shard	Name	Path	Free	Total	Used Percentage
1	default	/var/lib/clickhouse/	1.75 GiB	1.84 GiB	5.04
2	default	/var/lib/clickhouse/	1.75 GiB	1.84 GiB	4.81