[flyteagent] All agents return dict instead of literal map

[Future-Outlier]

Tracking issue

flyteorg/flyte#3936

Why are the changes needed?

When users trace the code, they tend to follow patterns we use in Flytekit's agent. By allowing them to use dict instead of LiteralMap, we can improve their development experience. This way, they don't need to understand the details of how LiteralMap works or what a literal is.

What changes were proposed in this pull request?

In the agent's get request:

Before:

• Returns a LiteralMap.

After:

• Returns a dict.

Note: We will automatically handle the conversion from dict to LiteralMap for the user.

• In local execution:
  flytekit base_agent.py
• In remote execution:
  flytekit agent_service.py

How was this patch tested?

Through unit tests.

Setup process

Screenshots

Check all the applicable boxes

• I updated the documentation accordingly.
• All new and existing tests passed.
• All commits are signed-off.

Related PRs

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