[BackupAndRestore] Support backup and restore view and external odbc table
1. Support backup and restore view and odbc table. The syntax is the same as that of the backup and restore table.
2. If the table associated with the view does not exist in the snapshot,
the view can still be backed up successfully, but the TableNotFound exception will be thrown when querying the view.
3. If the odbc table associated with the odbc resource, the odbc resource will be backuped and restored together.
4. If the same view, odbc table and resource already exists in the database, it will compare whether the metadata of snapshot is consistent.
If it is inconsistent, the restoration will fail.
4. This pr also modified the json format of the backup information.
A `new_backup_objects` object is added to the root node to store backup meta-information other than olap table,
such as views and external tables.
```
{
"backup_objects": {},
"new_backup_objects": {
"view": [
{"name": "view1", "id": "10001"}
],
"odbc_table": [
{"name":"xxx", xxx}
]
"odbc_resources": [
{"name": "bj_oracle"}
]
}
}
```
5. This pr changes the serialization and deserialization method of backup information
from manual construction to automatic analysis by Gson tools.
Change-Id: I216469bf2a6484177185d8354dcca2dc19f653f3
6bd22bc573