Added Manifest file to manage files on disk

[RRashmit]

Proposed changes

Testing:

Adding certs
Successfully added certs in the location and updated the manifest file. (Contains both referenced/unreferenced files)

Deleting certs
Restarted the agent and performed deletion
Successfully deleted the files from the location
and sucessfully updated the manifest file.
Rollback action
Successfully Rollback

Checklist

Before creating a PR, run through this checklist and mark each as complete.

• I have read the CONTRIBUTING document
• I have run make install-tools and have attached any dependency changes to this pull request
• If applicable, I have added tests that prove my fix is effective or that my feature works
• If applicable, I have checked that any relevant tests pass after adding my changes
• If applicable, I have updated any relevant documentation (README.md)
• If applicable, I have tested my cross-platform changes on Ubuntu 22, Redhat 8, SUSE 15 and FreeBSD 13

[aphralG]

Small thing, could the converting of the map to files be done once

Suggested change

	manifestFileErr := fms.UpdateManifestFile(files.ConvertToMapOfFiles(fileOverview.GetFiles()))
	files := files.ConvertToMapOfFiles(fileOverview.GetFiles())
	fms.UpdateCurrentFilesOnDisk(files)
	manifestFileErr := fms.UpdateManifestFile(files)

[aphralG]

Should this be || ? Or can there be an error but we are still able to read the files ?

[RRashmit]

This actually caters all other scenarios when there is actual error in getting the manifest file except the first time when the file is still to be created (in that case manifestFiles won't be nil)