Dolt interactive sql-client cli: Support database name for connection

[dphil]

A minor quality of life suggestion.

ex. dolt sql-client -u root <dbName>
or dolt sql-client -u root <dbName>/<branchName> for a branch-specific connection

The above work with a normal mysql client, just not the dolt sql-client, requiring an extra use <dbName> after the connection is made.

[timsehn]

I ran into this yesterday myself.

We're actually reworking dolt sql right now so that it can connect to a running server. This may obviate the need for dolt sql-client.

@macneale4 for visibility.

[stephkyou]

dolt sql-client has been fully deprecated in favor of dolt sql.