Added distinct decoder registries by model type

[tgaddair]

No description provided.

[arnavgarg1]

Looks great, thanks for putting this together so quickly 🔥
Only one minor nit

[github-actions]

Unit Test Results

       6 files  ±       0         6 suites  ±0   5h 2m 0s ⏱️ + 3h 0m 51s
2 700 tests +2 510  2 663 ✔️ +2 503  35 💤 +  6  2 ❌ +1 
2 986 runs  +2 764  2 918 ✔️ +2 733  65 💤 +30  3 ❌ +1 

For more details on these failures, see this check.

Results for commit 4a7513d. ± Comparison against base commit b9345ce.

This pull request removes 35 and adds 2545 tests. Note that renamed tests count towards both.

tests.integration_tests.test_cli ‑ test_reproducible_cli_runs[horovod-experiment-1919-0]
tests.integration_tests.test_cli ‑ test_reproducible_cli_runs[horovod-experiment-1919-1]
tests.integration_tests.test_cli ‑ test_reproducible_cli_runs[horovod-experiment-31-0]
tests.integration_tests.test_cli ‑ test_reproducible_cli_runs[horovod-experiment-31-1]
tests.integration_tests.test_cli ‑ test_reproducible_cli_runs[horovod-train-1919-0]
tests.integration_tests.test_cli ‑ test_reproducible_cli_runs[horovod-train-1919-1]
tests.integration_tests.test_cli ‑ test_reproducible_cli_runs[horovod-train-31-0]
tests.integration_tests.test_cli ‑ test_reproducible_cli_runs[horovod-train-31-1]
tests.integration_tests.test_cli ‑ test_train_cli_horovod
tests.integration_tests.test_experiment ‑ test_experiment_model_resume_distributed[horovod]
…

tests.ludwig.augmentation.test_augmentation_pipeline ‑ test_image_augmentation[augmentation_pipeline_ops0]
tests.ludwig.augmentation.test_augmentation_pipeline ‑ test_image_augmentation[augmentation_pipeline_ops1]
tests.ludwig.augmentation.test_augmentation_pipeline ‑ test_image_augmentation[augmentation_pipeline_ops2]
tests.ludwig.augmentation.test_augmentation_pipeline ‑ test_invalid_augmentation_parameters[None]
tests.ludwig.augmentation.test_augmentation_pipeline ‑ test_invalid_augmentation_parameters[augmentation_pipeline_ops1]
tests.ludwig.augmentation.test_augmentation_pipeline ‑ test_invalid_augmentation_parameters[augmentation_pipeline_ops2]
tests.ludwig.augmentation.test_augmentation_pipeline ‑ test_invalid_augmentation_parameters[augmentation_pipeline_ops4]
tests.ludwig.augmentation.test_augmentation_pipeline ‑ test_invalid_augmentation_parameters[random_horizontal_flip]
tests.ludwig.augmentation.test_augmentation_pipeline ‑ test_load_model_with_augmentation_pipeline
tests.ludwig.augmentation.test_augmentation_pipeline ‑ test_local_model_training_with_augmentation_pipeline[preprocessing0-encoder0-False]
…

This pull request removes 13 skipped tests and adds 19 skipped tests. Note that renamed tests count towards both.

tests.integration_tests.test_horovod ‑ test_horovod_gpu_memory_limit
tests.integration_tests.test_torchscript ‑ test_torchscript_postproc_gpu[binary_feature]
tests.integration_tests.test_torchscript ‑ test_torchscript_postproc_gpu[category_feature]
tests.integration_tests.test_torchscript ‑ test_torchscript_postproc_gpu[number_feature]
tests.integration_tests.test_torchscript ‑ test_torchscript_postproc_gpu[sequence_feature]
tests.integration_tests.test_torchscript ‑ test_torchscript_postproc_gpu[set_feature]
tests.integration_tests.test_torchscript ‑ test_torchscript_postproc_gpu[text_feature]
tests.integration_tests.test_torchscript ‑ test_torchscript_postproc_gpu[vector_feature]
tests.integration_tests.test_torchscript ‑ test_torchscript_preproc_gpu[audio_feature]
tests.integration_tests.test_torchscript ‑ test_torchscript_preproc_gpu[date_feature]
…

tests.ludwig.automl.test_base_config
tests.ludwig.automl.test_utils
tests.ludwig.backend.test_ray
tests.ludwig.benchmarking.test_profiler
tests.ludwig.data.test_ray_data
tests.ludwig.features.test_sequence_features ‑ test_sequence_preproc_module_bert_tokenizer
tests.ludwig.features.test_sequence_features ‑ test_sequence_preproc_module_clip_tokenizer
tests.ludwig.features.test_sequence_features ‑ test_sequence_preproc_module_gpt2bpe_tokenizer
tests.ludwig.features.test_sequence_features ‑ test_sequence_preproc_module_sentencepiece_tokenizer
tests.ludwig.utils.test_fs_utils ‑ test_get_fs_and_path_invalid_windows
…