use pkg extension for gpu

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 0% with 75 lines in your changes are missing coverage. Please review.

Project coverage is 46.16%. Comparing base (91a3fe0) to head (952f35b). Report is 33 commits behind head on 0.3.

:exclamation: Current head 952f35b differs from pull request most recent head 9dc967f. Consider uploading reports for the commit 9dc967f to get more accurate results

Files	Patch %	Lines
src/device.jl	0.00%	72 Missing :warning:
ext/TransformersAMDGPUExt/TransformersAMDGPUExt.jl	0.00%	1 Missing :warning:
ext/TransformersCUDAExt/TransformersCUDAExt.jl	0.00%	1 Missing :warning:
ext/TransformersMetalExt/TransformersMetalExt.jl	0.00%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## 0.3 #178 +/- ## ========================================== - Coverage 46.52% 46.16% -0.36% ========================================== Files 85 88 +3 Lines 4400 4425 +25 ========================================== - Hits 2047 2043 -4 - Misses 2353 2382 +29 ```

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[codetalker7]

Can we also update the TextEncodeBase compat entry to 0.8?

[chengchingwen]

@codetalker7 There are some breaking changes in TextEncodeBase v0.8, so I would merge this PR to another branch that handles the breaking changes