Add a feature to pass user provided files during qcow2ova image conversion

[Amulyam24]

What this PR does / why we need it:
This PR adds a feature to allow user to add custom files to the image built.
--write-files-list is a comma separated list of files and --write-to-dir-path is the path where the files are written in the built image

example:

pvsadm image qcow2ova --image-name test-image --image-dist centos --image-url https://cloud.centos.org/centos/10-stream/ppc64le/images/CentOS-Stream-GenericCloud-10-latest.ppc64le.qcow2 --prep-template ./image-prep.template --write-files-list key.pub,files --write-to-dir-path /home/user

Tested the following scenarios

1. Copy multiple files and directories
2. Copy nested directories
3. If destination path doesn't exist, creates and copies to it

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Fixes #811

Special notes for your reviewer:

**Output/Demonstration

Add a feature to pass user provided files during qcow2ova image conversion

[ppc64le-cloud-bot]

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