Add support for Octopus Release Badges

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Projects should support release badges — dynamically generated SVG badges that display the latest release version for a given project and channel.

Key highlights:

• A new badge builder UI is available in project settings, making it easy to configure and copy badge markup (Markdown or HTML) for use in READMEs and other documentation.
• Badges can be enabled or disabled per project via a new Badges toggle in project settings.
• Badge endpoints support anonymous access so they can be embedded anywhere without authentication.
• A JSON endpoint is also available, enabling integration with alternative services such as shields.io dynamic badges for additional customisation and caching.

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Badges are now available on Project Settings

Including an in-app badge builder to help generate the require markdown, htlm or url