Add security headers to the ZenML server

[stefannica]

Describe changes

There are a set of HTTP headers that can be added to all ZenML server responses for improved security. This PR adds them by using the middleware supplied with the secure Python library.

For comparison:

• headers scan for a server without headers
• headers scan for a server with headers

NOTE: the content-security-policy security headers are by default set to a "non-safe" value because the dashboard code requires special handling to allow its support. More details here: https://content-security-policy.com/examples/allow-inline-script/

Pre-requisites

Please ensure you have done the following:

• I have read the CONTRIBUTING.md document.
• If my change requires a change to docs, I have updated the documentation accordingly.
• I have added tests to cover my changes.
• I have based my new branch on develop and the open PR is targeting develop. If your branch wasn't based on develop read Contribution guide on rebasing branch to develop.
• If my changes require changes to the dashboard, these changes are communicated/requested.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Other (add details above)

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[socket-security]

New and removed dependencies detected. Learn more about Socket for GitHub ↗︎

Package	New capabilities	Transitives	Size	Publisher
pypi/secure@0.3.0	eval, filesystem, shell	0	59.6 kB	cakinney

View full report↗︎

[strickvl]

You know it'll be secure when the package name is secure ;)

[avishniakov]

🦭