feat(interactive): Support `override` in import.yaml

[zhanglei1949]

Currently, we only support init option. i.e.

graph: graph_algo
loading_config:
  data_source:
    scheme: file  # file, oss, s3, hdfs; only file is supported now
    location: /home/graphscope/graph_algo/
  import_option: init 

It is common for user to overwrite the currently graph with updated data, so import_option: overwrite should be supported.

[yecol]

Is the scheme separated from location? It is strange. Why not use location as a complete URI? such as

• oss://bucket/file.txt
• https://pan.baidu.com/x.csv