Provide the ability to "Open raw" on markdown files inside a bitbucket wiki

Normally, markdown content hosted in Bitbucket can be extracted by using the "Open raw" action on the ellipsis menu.

(e.g. The file https://bitbucket.org/adastradev/test-open-source-pipeline/src/master/Readme.md can be viewed at https://bitbucket.org/adastradev/test-open-source-pipeline/raw/d663c4c3eb8c464bd10c03cc66f4d0b5b80c32c4/Readme.md).

This is very helpful for integrations with Confluence, where the Markdown Extensions for Confluence plugin can mirror markdown content that needs to be version controlled out in Confluence for a wider audience.

For Bitbucket wiki pages (e.g. https://bitbucket.org/adastradev/png-engineering-practices/wiki/dev-tool-chain-git.md), there doesn't appear to be any way to see the raw markdown markup, so it is not possible to mirror any of the Bitbucket wiki content in Confluence).