Feature Request: Add an Option for Concatenating Arrays in ValuesStore.merge

[KLBeneteau]

Description

The ValuesStore.merge method currently uses lodash.merge to merge objects. While this works well for merging nested objects, it poses a challenge when dealing with arrays. Specifically, lodash.merge merges arrays index by index, which is often not the desired behavior when working with session data.

For example, merging the following objects:

const original = {
  alerts: [
    { message: 'Alert 1', type: 'info' },
  ],
};

const newValues = {
  alerts: [
    { message: 'Alert 2', type: 'error' },
  ],
};

valuesStore.merge(newValues);

result in :

{
  alerts: [
    { message: 'Alert 2', type: 'error' },
  ],
}

This behavior makes it cumbersome to simply concatenate arrays, which is a common need in many use cases.