Rationale

Sometimes we need to change some nested properties and we don't want to nail other properties (to make it possible to update them via discovery).
For example:

{
  "main": {
    "poet-server": ["https://mainnet-poet-0.spacemesh.network"]
  },
  "p2p": {
    "disable-reuseport": true
  }
}

Acceptance criteria

• It deeply merges the custom config on top of the config fetched from the discovery
• It deeply merges only Objects, other types (primitives and arrays) are just replaced. So if you want to append some values to the array — copy-paste the entire array from the original config and append the required value to it.
• If User specified "someProp": null — merging configs should omit someProp key

Example

// config in discovery
{
  a: 123,
  b: { c: { d: 5, e: 7, f: 10 }, x: 10, y: 15, z: 20 },
}

// custom config
{
  a: 256,
  b: {
    c: { d: 6, e: null },
    x: null,
    z: 25
}

// config result
{
  a: 256,
  b: {
    c: { d: 6, f: 10 },
    y: 15,
    z: 25
  }
}