[teamsyncd] Update "oper_status" of LAG_TABLE in state_db (#3192)

[super-jiying]

What I did

Fix for #3192

How I did it

In teamSync::addLag method, update lag "oper_status" status in both state_db and appl_db.

How to verify it

Manual Testing

[linux-foundation-easycla[bot]]

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