FEAT: parameterised headers rest_api_source

[ArneDePeuter]

Description

This pull request addresses the feature request discussed in issue dlt-hub#2071. It introduces dynamic parameter resolution for headers, allowing both keys and values to be resolved dynamically.

Key Features

• Dynamic Header Resolution: Supports resolving both header keys and values at runtime using specified parameters.
• Header params can also be bound to provided params
• You can still define headers in the client, these will always be used. Endpoint specific parameters extend this dict.

Usage

The feature is demonstrated with the following example:
{ "name": "chicken", "endpoint": { "path": "chicken", "headers": {"{token}": "{token}", "num": "2"}, "params": { "token": { "type": "resolve", "field": "token", "resource": "authenticate", }, }, }, }

Tests

Comprehensive tests have been added to validate the implementation and ensure its correctness.

[ArneDePeuter]

Oops mistake, here is the right one: dlt-hub#2084