feat(blueprint): Add blueprint context templating with Jsonnet support

[rmvangun]

Adds blueprint context templating functionality that enables dynamic configuration generation using Jsonnet templates.

Key Features:

• Process Jsonnet templates from contexts/_template/ directory
• Merge template-generated values into blueprint components
• Support for context-aware template evaluation with std.extVar("context")
• Enhanced terraform generator with template processing pipeline

Additional Changes:

• Converted interface{} to any
• Moved YamlMarshalWithDefinedPaths to a centralized location in config handler so that it can be used by both the Terraform generator and blueprint handler