feat: Add checkpoint loading for Contentstack sync initialization

[aman19K]

This PR introduces checkpoint file support during the Contentstack sync initialization. Key updates include:

• Added loadCheckpoint function to read existing sync token from a hidden file.
• Implemented readHiddenFile utility to safely read and parse JSON from disk.
• Integrated checkpoint loading into the init lifecycle to resume sync from the last known state.
• Added fallback logic to look for a default .checkpoint file if none is found at the specified path.

These changes enhance resiliency and efficiency by enabling sync resume capabilities, reducing redundant content fetching on service restarts

[Copilot]

Pull Request Overview

This PR adds support for reading and applying checkpoint files during the Contentstack sync initialization to resume from the last known state and avoid redundant fetches.

• Introduces loadCheckpoint and readHiddenFile functions for loading and parsing a JSON checkpoint.
• Hooks checkpoint loading into the init lifecycle with fallback logic to a default file path.
• Expands config schema with checkpoint options and bumps the package version.

Reviewed Changes

Copilot reviewed 4 out of 5 changed files in this pull request and generated 3 comments.

File	Description
src/core/plugins.ts	Added try/catch around plugin loading to surface errors.
src/core/index.ts	Implemented loadCheckpoint, readHiddenFile, and integrated checkpoint logic into init.
src/config.ts	Added checkpoint settings (enabled, filePath, preserve).
package.json	Updated version from 2.0.11 to 2.1.0.

Comments suppressed due to low confidence (3)

src/core/index.ts:84

• The variable checkPointConfig has inconsistent capitalization; consider renaming it to checkpointConfig for consistency with the interface name.

 const checkPointConfig: ICheckpoint = config.checkpoint

src/core/index.ts:122

• There are no unit tests covering the new loadCheckpoint and readHiddenFile behaviors; consider adding tests for successful load, fallback, missing file, and parse errors.

const loadCheckpoint = (checkPointConfig: ICheckpoint, paths: any): void => {

src/core/index.ts:54

• The preserve flag in ICheckpoint is neither documented nor implemented; add comments or implement its behavior, and correct formatting to preserve: boolean.

 preserve:boolean

[harshithad0703]

LGTM