feat(query): support path select

[LorenzoSantoro94]

Description

Instead of simply copying each selected key to result object, it breaks each select arg string by dots and recursively copies each key.

Before

.select('a.b') => { 'a.b': ... }

After

.select('a.b') => {a: {b: ... }}

Related issues

Fixes #199

Limitations

If two paths inside same property are selected (e.g. "a.b" and "a.c") result will carry only the latest selected path.
See skipped test case

[Copilot]

Pull Request Overview

Adds support for selecting nested fields via dot paths in query.select, transforming flat key selections into a nested object structure.

• Introduces lodash.merge and a new buildDocFromPath helper to recursively build nested selections.
• Updates buildDocFromHash.js to apply selectFields.reduce with the new helper.
• Adds new test cases in query.test.js to cover nested selections, missing values, and multiple nested fields.

Reviewed Changes

Copilot reviewed 3 out of 4 changed files in this pull request and generated 2 comments.

File	Description
src/mocks/helpers/buildDocFromHash.js	Import merge, implement nested select logic, add buildDocFromPath helper
tests/query.test.js	Add tests for nested select behavior and streamline query chaining

Files not reviewed (1)

• package.json: Language not supported

Comments suppressed due to low confidence (1)

src/mocks/helpers/buildDocFromHash.js:67

• When the root property doesn’t exist on data, buildDocFromPath currently builds nested empty objects (e.g., {size: {height: {}}}) instead of returning {}. Add a guard: if data[root] is undefined or null, return {} immediately.

const [root, ...subPath] = path;

[Copilot]

[nitpick] Consider adding a JSDoc comment above buildDocFromPath to explain its parameters, return value, and overall behavior for better maintainability.

Suggested change

	/**
	* Recursively builds a nested object from a given data object and a path array.
	*
	* @param {Object} data - The source object containing the data to extract.
	* @param {string[]} path - An array of strings representing the path to the desired data.
	* Each string corresponds to a key in the object hierarchy.
	* @returns {Object} A new object containing the data at the specified path. If the path
	* does not exist in the data, an empty object is returned.
	*/