[FEATURE REQUEST] Require Relative SLS

[Pheric]

Repost of closed issue #10838.

I would like to require a relative SLS, in the same fashion as including a relative sls:

include:
  - .anothersls

State Requiring Relative SLS:
  test.nop:
    - require:
      - sls: .anothersls

A current alternative way to do the above, as mentioned by @mallniya (but updated for modern versions of Salt):

include:
  - .anothersls

State Requiring Relative SLS:
  test.nop:
    - require:
      - sls: {{ slsdotpath }}.anothersls

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