fix: fixed fp8 import so as to not require user to import

[JRosenkranz]

Description of the change

Added an import as part of fp8 addons as this should not be required by the user and should happen implicitly.

Related issues or PRs

foundation-model-stack/aiu-fms-testing-utils#103

How to verify the PR

To verify the PR, run test_decoders in aftu with the following variables:

FMS_TEST_SHAPES_SKIP_ASSERTIONS=mean_diff 
FMS_TEST_SHAPES_USE_MICRO_MODELS=0 
FMS_TEST_SHAPES_COMMON_MODEL_PATHS=ibm-ai-platform/micro-g3.3-8b-instruct-1b-FP8  
FMS_TEST_SHAPES_COMMON_BATCH_SIZES=1 
FMS_TEST_SHAPES_COMMON_SEQ_LENGTHS=128 
FMS_TEST_SHAPES_FAILURE_THRESHOLD=0.06 
FMS_TEST_SHAPES_ATTN_TYPE=math_fp8

Was the PR tested

• I have added >=1 unit test(s) for every new method I have added (if that coverage is difficult, please briefly explain the reason)
• I have ensured all unit tests pass

Checklist for passing CI/CD:

• All commits are signed showing "Signed-off-by: Name <[email protected]>" with git commit -signoff or equivalent
• PR title and commit messages adhere to Conventional Commits
• Contribution is formatted with tox -e fix
• Contribution passes linting with tox -e lint
• Contribution passes spellcheck with tox -e spellcheck
• Contribution passes all unit tests with tox -e unit

Note: CI/CD performs unit tests on multiple versions of Python from a fresh install. There may be differences with your local environment and the test environment.

[tharapalanivel]

LGTM