feat: superposition_toml updates with map and new context format

[knutties]

Problem

The current cac-toml implementation did not use the superposition_core for config resolution and did not have the updated map interface for the context.

Solution

This solution switches to using a ; separated key-value pair for contexts instead of the PEG parser for expressions. We could make this into its own provider - say superposition_toml_provider.

Environment variable changes

NA

Pre-deployment activity

NA

Post-deployment activity

NA

API changes

NA

Possible Issues in the future

NA