Add max depth configuration

[jotavemonte]

Summary

Add a Max Depth setting that controls the max depth for the graph. The default value "0" means it's limitless.

Changes

• Add max depth configuration
• Add readme section

Testing

Reproducing

1. Generate a build for the branch. I'll skip the details for this section.
2. Add the testing code added at the end of this section.
3. Try different max depth values and generate both outgoing and incoming call-graphs.

Evidences

Test code

function a() {
    b()
    b2()
}

function b() {
    c1()
    c3()
}

function b2() {
    c1()
    c2()
    c3()
}

function c1() {
    return "c1"
}

function c2() {
    return "c2"
}

function c3() {
    return "c3"
}

[beicause]

Thank you. I think seting max depth in settings is a bit inconvinent. What about inputing it in Quick Pick? https://code.visualstudio.com/api/ux-guidelines/quick-picks

[jotavemonte]

Thank you. I think seting max depth in settings is a bit inconvinent. What about inputing it in Quick Pick? https://code.visualstudio.com/api/ux-guidelines/quick-picks

Hey, since we don't have a max depth by default and it's not a core feature, wouldn't it degrade the UX to add one extra step to the graph generation? @beicause

[beicause]

Yeah, this feature is rarely used unless the project is large and takes long time to generate call graph. It's better to configure depth in settings.