Unify parameters styling between calls

[checorone]

Client generation changes.

In a complex services there could be 10+ parameters for each call, and we don't want to pass all of them in a direct manner. Instead we suppose to use some sort of struct to collect all related call parameters together. By the way, there are already generated structs for it in the type.go file.

Oneline advantages of this PR :

• You don't need to specify all optional parameters for call
• You don't need to count position for each param in function call, provide it by name

Breaking change.

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[checorone]

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[timburks]

@checorone Thanks for adding this! It makes sense and is what we usually see for Protocol Buffer-based APIs. I'll merge this and tag a new version.