feat(http): update query manual compaction interface

[hycdong]

#696 adds a http interface to query manual compaction status, this pr updates it:

• rename all compact and compaction into manual_compact and manual_compaction
• add a new status kIdle to distinguish not execute manual compaction and manual compaction finished
• update count in response from string into integer

The previous request and response is like:

curl 'http://localhost:34801/replica/compaction?app_id=1'
{
    "status": {
        "CompactionFinish": "8", 
        "CompactionQueue": "0", 
        "CompactionRunning": "0"
    }
}

The new request and response is like:

curl 'http://localhost:34801/replica/manual_compaction?app_id=1'
{
    "status": {
        "finished": 8,
        "idle": 0, 
        "queuing": 0, 
        "running": 0
    }
}