'add' on array attribute performs 'replace' when 'path' is absent

[asutosh97]

Describe the bug

Let's look at the following 4 code snippets and their corresponding outputs

Case 1

Code

const scimResource = {
    displayName: "ramayan",
    members: [
        { name: "ram" },
        { name: "laxman" }
    ]
}

const patches = {
    Operations: [
        {
            op: "add",
            path: "members",
            value: { name: "hanuman" }
        },
    ]
}

const patchedResource = scimPatch(scimResource, patches.Operations, { mutateDocument: false });
console.log(patchedResource);

Output

{
  displayName: 'ramayan',
  members: [ { name: 'ram' }, { name: 'laxman' }, { name: 'hanuman' } ]
}

Case 2

Code

const scimResource = {
    displayName: "ramayan",
    members: [
        { name: "ram" },
        { name: "laxman" }
    ]
}

const patches = {
    Operations: [
        {
            op: "add",
            path: "members",
            value: [{ name: "hanuman" }]
        },
    ]
}

const patchedResource = scimPatch(scimResource, patches.Operations, { mutateDocument: false });
console.log(patchedResource);

Output

{
  displayName: 'ramayan',
  members: [ { name: 'ram' }, { name: 'laxman' }, { name: 'hanuman' } ]
}

Case 3

Code

const scimResource = {
    displayName: "ramayan",
    members: [
        { name: "ram" },
        { name: "laxman" }
    ]
}

const patches = {
    Operations: [
        {
            op: "add",
            value: {
                members: { name: "hanuman" }
            }
        },
    ]
}

const patchedResource = scimPatch(scimResource, patches.Operations, { mutateDocument: false });
console.log(patchedResource);

Output

{ displayName: 'ramayan', members: { name: 'hanuman' } }

Case 4

Code

const scimResource = {
    displayName: "ramayan",
    members: [
        { name: "ram" },
        { name: "laxman" }
    ]
}

const patches = {
    Operations: [
        {
            op: "add",
            value: {
                members: [{ name: "hanuman" }]
            }
        },
    ]
}

const patchedResource = scimPatch(scimResource, patches.Operations, { mutateDocument: false });
console.log(patchedResource);

Output

{ displayName: 'ramayan', members: [ { name: 'hanuman' } ] }

Case 1 & 2 give the correct output, whereas case 3 & 4 produce the wrong output.
For case 3 & 4, if the operation was "replace", then that output would have been correct.

I've figured out a fix, will be creating a PR soon