Add basic profiling support for supervisor

[fyrestone]

What do these changes do?

• Add a enable_profiling extra config, default is False. e.g. a.execute(show_progress=False, extra_config={"enable_profiling": True})
• Fix extra_config for web session.
• Sample profile result for supervisor.

WARNING  mars.deploy.oscar.session:session.py:861 Profile task PO1e7wSe4DFpxzoFk5IKYiey execution result:
{
    "supervisor": {
        "general": {
            "optimize": 0.002045869827270508,
            "incref_fetch_tileables": 0.003548145294189453,
            "stage_g9ovAV2iVQQS20b2ym8lbrMt": {
                "tile": 0.02925896644592285,
                "gen_subtask_graph": 0.05370688438415527,
                "run": 0.19794082641601562,
                "total": 0.29035496711730957
            },
            "total": 0.299562931060791
        },
        "serialization": {
            "serialize": 0.014928340911865234,
            "deserialize": 0.0011813640594482422,
            "total": 0.016109704971313477
        }
    }
}

Related issue number

N/A

Check code requirements

• tests added / passed (if needed)
• Ensure all linting tests pass, see here for how to run them

[wjsi]

LGTM

[hekaisheng]

LGTM

[qinxuye]

LGTM