[RPD-309] Update stack set to add individual modules to the matcha.config.json file

[JonoCX]

This PR updates the stack_set function such that the components of the respective stacks (default and llm) are included in the matcha.config.json.

To do this, the PR introduces two constants: DEFAULT_STACK and LLM_STACK. The contents of these constants are then added to MatchaConfigComponent, along with the name. The tests have been refactored to reflect this change.

I have also updated the name of the original DEFAULT_STACK and LLM_STACK in matcha_ml.templates.azure_template to DEFAULT_STACK_TF and LLM_STACK_TF respectively. This is to avoid a naming conflict and the newer constants more actually describe the stack.

Checklist

Please ensure you have done the following:

• I have read the CONTRIBUTING guide.
• I have updated the documentation if required.
• I have added tests which cover my changes.

Type of change

Tick all those that apply:

• Bug Fix (non-breaking change, fixing an issue)
• New feature (non-breaking change to add functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Other (add details above)

[Christopher-Norman]

Beautiful, nice work. Added a single comment as an FYI but is irrelevant to this PR.

[Christopher-Norman]

FYI: LLM_STACK_TF and DEFAULT_STACK_TF will become redundant with the modular implementation. I have created tickets for their removal and updating wherever they are used 👍

[swells2020]

LGTM 🥇