Add Descript-Audio-Codec model (#31494)

* dac model

* original dac works

* add dac model

* dac can be instatiated

* add forward pass

* load weights

* all weights are used

* convert checkpoint script ready

* test

* add feature extractor

* up

* make style

* apply cookicutter

* fix tests

* iterate on FeatureExtractor

* nit

* update dac doc

* replace nn.Sequential with nn.ModuleList

* nit

* apply review suggestions 1/2

* Update src/transformers/models/dac/modeling_dac.py

Co-authored-by: Sanchit Gandhi <93869735+sanchit-gandhi@users.noreply.github.com>

* up

* apply review suggestions 2/2

* update padding in FeatureExtractor

* apply review suggestions

* iterate on design and tests

* add integration tests

* feature extractor tests

* make style

* all tests pass

* make style

* fixup

* apply review suggestions

* fix-copies

* apply review suggestions

* apply review suggestions

* Update docs/source/en/model_doc/dac.md

Co-authored-by: Yoach Lacombe <52246514+ylacombe@users.noreply.github.com>

* Update docs/source/en/model_doc/dac.md

Co-authored-by: Yoach Lacombe <52246514+ylacombe@users.noreply.github.com>

* anticipate transfer weights to descript

* up

* make style

* apply review suggestions

* update slow test values

* update slow tests

* update test values

* update with CI values

* update with vorace values

* update test with slice

* make style

---------

Co-authored-by: Sanchit Gandhi <93869735+sanchit-gandhi@users.noreply.github.com>
Co-authored-by: Yoach Lacombe <52246514+ylacombe@users.noreply.github.com>

docs/source/en/index.md

@@ -105,6 +105,7 @@ Flax), PyTorch, and/or TensorFlow.
 |                       [CPM-Ant](model_doc/cpmant)                        |       ✅        |         ❌         |      ❌      |
 |                          [CTRL](model_doc/ctrl)                          |       ✅        |         ✅         |      ❌      |
 |                           [CvT](model_doc/cvt)                           |       ✅        |         ✅         |      ❌      |
+|                           [DAC](model_doc/dac)                           |       ✅        |         ❌         |      ❌      |
 |                   [Data2VecAudio](model_doc/data2vec)                    |       ✅        |         ❌         |      ❌      |
 |                    [Data2VecText](model_doc/data2vec)                    |       ✅        |         ❌         |      ❌      |
 |                   [Data2VecVision](model_doc/data2vec)                   |       ✅        |         ✅         |      ❌      |