Add a SPARQL mode

[Dietr1ch]

There is currently no extended support for SPARQL. Although it's use it's far from massive it would be nice to add support at least for highlighting.
I think that this should be done on extra-langs until a new Query Language Layer is created grouping support for SQL, SPARQL and other NoSQL modes (Neo4j, MongoDB, CouchDB, ArangoDB (AQL), OrientDB, ...)

System Info

• OS: gnu/linux
• Emacs: 24.5.1
• Spacemacs: 0.104.2
• Spacemacs branch: nil (rev. 074f425)
• Distribution: spacemacs
• Layers:

(auto-completion syntax-checking c-c++ clojure d emacs-lisp haskell html javascript latex markdown python ruby rust scala sql colors
                 (git :variables git-enable-github-support t git-gutter-use-fringe t)
                 version-control gtags org
                 (shell :variables shell-default-width 120 shell-default-height 30 shell-default-position 'right shell-default-term-shell "/bin/zsh"))

[robbyoconnor]

Can't hurt to just make a PR -- worst case scenario you move the directory 😜

[Dietr1ch]

I'm looking on how to contribute ;), but I'm new on EMACS.

I don't want to miss something important while just adding more packages to the list, I suppose I may break things if I don't review what is actually being done.

[robbyoconnor]

@Dietr1ch pop onto the gitter chat -- we have a guide for that ;)

[fleimgruber]

#3248 says it fixes this. This was put into +lang/extra-langs which was later moved to +lang/major-modes. sparql-mode is missing from there though. I will try to patch with #3248 there.

[fleimgruber]

This is obsolete as sparql-mode is in http://develop.spacemacs.org/layers/+lang/semantic-web/README.html

[github-actions]

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