Add a keyboard shortcut for the History when in the blob viewer
### Problem to solve
Viewing the file history to see changes and collaborators is a common action. When navigating to a file it would be nice to be able to quickly load the history with a shortcut. Like the permalink URL shortcut.
### Intended users
* [Rachel (Release Manager)](https://about.gitlab.com/handbook/marketing/product-marketing/roles-personas/#rachel-release-manager)
* [Delaney (Development Team Lead)](https://about.gitlab.com/handbook/marketing/product-marketing/roles-personas/#delaney-development-team-lead)
* [Sasha (Software Developer)](https://about.gitlab.com/handbook/marketing/product-marketing/roles-personas/#sasha-software-developer)
* [Simone (Software Engineer in Test)](https://about.gitlab.com/handbook/marketing/product-marketing/roles-personas/#simone-software-engineer-in-test)
### Proposal
Add a frontend shortcut to display the current file's history page
### Permissions and Security
Works on the file pages that a user has access to
### Documentation
Updates to the shortcuts modal and related docs
### Links / references
issue