no-unlocalized-strings ignoreProperty option should extend to ignoring string values in subkeys

[judeatmerit]

If i have ignoreProperty: ["ignoreThis"] option set for no-unlocalized-string, it would be very helpful to also ignore any strings for subkeys under the ignored property.

const obj = {
  ignoreThis: {
    subkey: "This should be ignored by no-unlocalized-string too"
  }
};

[timofei-iatsenko]

close in favour of #50