Add support for mTLS

[robin-checkmk]

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What is the current behavior?

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Issue Number: #966

What is the new behavior?

Describe the behavior or changes that are being added by this PR.

mTLS is supported by leveraging the functionality of the fetch_url function from Ansible.

Other information

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This collection implements the functionality by leveraging ansible-core functionality. Support for this feature will not go beyond the support provided by the Ansible project.

[robin-checkmk]

@lgetwan I implemented this, but as you know, I do not really know Python, so while the Checkmk look schwifty, I would appreciate a thorough review on your end. The user in the linked ticket might be able to actually test this, as we have no means. Let's see if and how we can get this done together. :)