Integration service - Resolve variables for setup destination

[jkralik]

Feature Request:

Implement Resolution and Template Population for Headers and Endpoint Using Golang Syntax

Template Variables:

• deviceID
• href
• event types (array) - users can choose which they want to use: either one of them, joined with a separator, or calculate UUID.
• resource types (array) - users can choose which they want to use: either one of them, joined with a separator, or calculate UUID.

Acceptance Criteria:

• Implementation of resolving Golang templates.
• Unit tests are developed.
• Documentation is provided.