[MagpieTTS][TTS] Support local transformer in longform magpietts

[subhankar-ghosh]

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What does this PR do ?

Add local transformer support to Longform MagpieTTS.

Collection: [Note which collection this PR will affect]

TTS

Changelog

• Add specific line by line info of high level changes in this PR.

Usage

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# Add a code snippet demonstrating how to use this 
# Add --use_local_transformer  to the python command.

python examples/tts/magpietts_inference.py \
    --nemo_files ${CKPT} \
    --datasets_json_path ${DATASET_JSON_PATH} \
    --out_dir ${OUT_DIR} \
    --codecmodel_path ${CODEC} \
    --longform_mode auto \
    --longform_max_decoder_steps 50000 \
    --batch_size 10 \
    --use_cfg \
    --apply_attention_prior \
    --apply_prior_to_layers "0,1,2,3,4,5,6,7,8,9,10,11" \
    --estimate_alignment_from_layers "4,5,6,7" \
    --use_local_transformer \
    --run_evaluation

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[github-actions]

[🤖]: Hi @subhankar-ghosh 👋,

We wanted to let you know that a CICD pipeline for this PR just finished successfully.

So it might be time to merge this PR or get some approvals.

//cc @chtruong814 @ko3n1g @pablo-garay @thomasdhc