Support multi column results with using mongo query runner

[del-zhenwu]

What type of PR is this? (check all applicable)

• [x] Other

Description

Support the following queries for results parser when using mongodb:

    "fields": {
        "run_id": 1,
        "metrics.value.acc": 2
    },

We currently only support for two levels in fields

Related Tickets & Documents

Mobile & Desktop Screenshots/Recordings (if there are UI changes)