Generate HTTPS URLs by default in cld url

[TalLevAmi]

cld url sample returned http://res.cloudinary.com/.... The Upload and Admin API responses give both url and secure_url, but cld url gave only the HTTP form. Users copy these URLs into pages and share them, so HTTPS must be the default.

Brief Summary of Changes

• The url command (cloudinary_cli/core/utils.py) passes secure=True to cloudinary_url when cloudinary.config().secure is None.
• When the configuration sets secure (for example CLOUDINARY_URL=cloudinary://...?secure=true), the command uses that value.
• cld utils cloudinary_url does not change. It is a direct call to the SDK method.

What does this PR address?

• GitHub issue (Add reference - #XX)
• Refactoring
• New feature
• Bug fix
• Adds more tests

Are tests included?

• Yes
• No

Reviewer, please note:

• This changes the output of cld url. Please add it to the changelog of the next release.
• ?secure=false in CLOUDINARY_URL gives HTTPS on master too: the SDK stores the value as the string 'false', which is truthy. This PR does not change that SDK behavior.

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I ran the full test suite before pushing the changes and all the tests pass.

Local test run: I ran the full suite on Python 3.8 with Click 8.1.8. The new tests pass, and they fail without the fix. 8 tests in test_cli_agent.py and test_cli_config_oauth.py fail with stderr not separately captured on this branch and on master too. These tests need Click 8.2, which needs Python 3.10 or later. CI must confirm the full result.

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