Add call middleware type

[shawnmcknight]

📝 Description

There is no type signature for middleware definitions wrapping the call action. This PR adds a type signature for this.

💎 Type of change

• Bug fix (non-breaking change which fixes an issue)

🚦 How Has This Been Tested?

Updated local environment with types. Created a middleware wrapping call using this type definition.

🏁 Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• I have commented my code, particularly in hard-to-understand areas

[coveralls]

Pull Request Test Coverage Report for Build 2121

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.02%) to 93.674%

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Totals
Change from base Build 2093:	0.02%
Covered Lines:	3884
Relevant Lines:	4004

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💛 - Coveralls

[icebob]

Thx!

[shawnmcknight]

@icebob While testing out the types for another PR, I noticed that this change did not migrate from master to next. I'm not sure what the cycle is, or even if there is one, to port things from master to next. Let me know if there's anything I need to do to get this migrated to next or if that will just happen on its own at a later date.

[icebob]

@shawnmcknight you don't need it. Occasionally, I update changes from master to next.

It seems I've forgotten it before beta 6...