:sparkles: invoke caikit -> peft conversion at load time

[joerunde]

Description

This creates new tempdirs and invokes the caikit to peft conversion utility at prompt adapter load time when a decoder.pt format model is detected.

How Has This Been Tested?

Loaded up onto a dev pod and tested with the bloom_sentiment_1 fixture that was added with the conversion utility. Seems to work fine!

Need to add a unit test for this specifically, still have to get nox up and running locally. Opening this PR now for feedback.

Merge criteria:

• [ ] The commits are squashed in a cohesive manner and have meaningful messages.
• [ ] Testing instructions have been added in the PR body (for PRs involving changes that are not immediately obvious).
• [ ] The developer has manually tested the changes and verified that the changes work

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 96.80851% with 3 lines in your changes missing coverage. Please review.

Project coverage is 61.66%. Comparing base (a3620be) to head (95b2064).

Files with missing lines	Patch %	Lines
...lm_tgis_adapter/tgis_utils/convert_pt_to_prompt.py	0.00%	3 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #161 +/- ## ========================================== + Coverage 58.40% 61.66% +3.26% ========================================== Files 27 28 +1 Lines 1618 1693 +75 Branches 207 208 +1 ========================================== + Hits 945 1044 +99 + Misses 581 553 -28 - Partials 92 96 +4 ```

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