feat: renderSection option to retained data

[addngr]

Description
This PR is in reference to reported issue to resolve #7069, Added a new feature on renders a section's contents using renderSection('page_title', true) to prevent from auto cleans the data after displaying.

Added 2nd argument bool $saveData If is true, saves data for subsequent calls, if false, cleans the data after displaying.

Checklist:

• Securely signed commits
• Component(s) with PHPDoc blocks, only if necessary or adds value
• Unit testing, with >80% coverage
• User guide updated
• Conforms to style guide

[kenjis]

@addngr Thank you for sending this PR!

Can you add the changelog v4.4.0 based on the following?
https://github.com/codeigniter4/CodeIgniter4/blob/develop/admin/next-changelog-minor.rst
and add about this in the Enhancements section?

[addngr]

@kenjis, Thank you for quick response. Please have look changelog v4.4.0 added.

[kenjis]

@addngr Thank you!
Generally Okay, but I commented inline on a few points.

[kenjis]

Build error occurred.

/github/workspace/user_guide_src/source/changelogs/v4.4.0.rst: WARNING: document isn't included in any toctree
https://github.com/codeigniter4/CodeIgniter4/actions/runs/3932931900/jobs/6729062065

Please add v4.4.0 in the index file:
https://github.com/codeigniter4/CodeIgniter4/blob/develop/user_guide_src/source/changelogs/index.rst

[kenjis]

LGTM!

[kenjis]

@addngr This branch has conflicts that must be resolved.
Can you rebase?
See https://github.com/codeigniter4/CodeIgniter4/blob/develop/contributing/workflow.md#updating-your-branch

[kenjis]

@addngr Thank you!

[addngr]

@kenjis Thank you for your valuable guidance. I have been successfully completed my 1st contribution to open source project. I have learned a lot by doing a contribution to such great work.

[kenjis]

@addngr Your PR was no problem. It was very well. 👍
In fact some people can not complete their PRs with lack of skills.
I think you could contribute most of PHP open source projects.