AED greedy confidence estimation
<!-- pylint-output-strict-mode-false -->

beep boop 🤖: 🙏 The following files have warnings. In case you are familiar with these, please try helping us to improve the code base.

---

Your code was analyzed with PyLint. The following annotations have been identified:

```
************* Module nemo.collections.asr.modules.transformer.transformer_generators
nemo/collections/asr/modules/transformer/transformer_generators.py:382:0: C0115: Missing class docstring (missing-class-docstring)
nemo/collections/asr/modules/transformer/transformer_generators.py:508:0: C0115: Missing class docstring (missing-class-docstring)
nemo/collections/asr/modules/transformer/transformer_generators.py:855:0: C0115: Missing class docstring (missing-class-docstring)
************* Module nemo.collections.asr.parts.submodules.multitask_decoding
nemo/collections/asr/parts/submodules/multitask_decoding.py:66:0: C0301: Line too long (121/119) (line-too-long)
nemo/collections/asr/parts/submodules/multitask_decoding.py:89:0: C0301: Line too long (125/119) (line-too-long)
nemo/collections/asr/parts/submodules/multitask_decoding.py:114:0: C0301: Line too long (127/119) (line-too-long)
nemo/collections/asr/parts/submodules/multitask_decoding.py:126:0: C0301: Line too long (122/119) (line-too-long)
nemo/collections/asr/parts/submodules/multitask_decoding.py:430:0: C0301: Line too long (121/119) (line-too-long)
nemo/collections/asr/parts/submodules/multitask_decoding.py:453:0: C0301: Line too long (125/119) (line-too-long)
nemo/collections/asr/parts/submodules/multitask_decoding.py:478:0: C0301: Line too long (127/119) (line-too-long)
nemo/collections/asr/parts/submodules/multitask_decoding.py:599:0: C0301: Line too long (120/119) (line-too-long)
nemo/collections/asr/parts/submodules/multitask_decoding.py:164:4: C0116: Missing function or method docstring (missing-function-docstring)
nemo/collections/asr/parts/submodules/multitask_decoding.py:606:0: C0115: Missing class docstring (missing-class-docstring)
nemo/collections/asr/parts/submodules/multitask_decoding.py:15:0: W0611: Unused import re (unused-import)
************* Module nemo.collections.asr.parts.submodules.multitask_greedy_decoding
nemo/collections/asr/parts/submodules/multitask_greedy_decoding.py:184:0: C0301: Line too long (123/119) (line-too-long)
nemo/collections/asr/parts/submodules/multitask_greedy_decoding.py:238:0: C0301: Line too long (125/119) (line-too-long)
nemo/collections/asr/parts/submodules/multitask_greedy_decoding.py:31:0: C0116: Missing function or method docstring (missing-function-docstring)
nemo/collections/asr/parts/submodules/multitask_greedy_decoding.py:68:0: C0115: Missing class docstring (missing-class-docstring)
nemo/collections/asr/parts/submodules/multitask_greedy_decoding.py:90:4: C0116: Missing function or method docstring (missing-function-docstring)
nemo/collections/asr/parts/submodules/multitask_greedy_decoding.py:99:4: C0116: Missing function or method docstring (missing-function-docstring)
nemo/collections/asr/parts/submodules/multitask_greedy_decoding.py:257:0: C0115: Missing class docstring (missing-class-docstring)
************* Module nemo.collections.asr.parts.utils.asr_confidence_utils
nemo/collections/asr/parts/utils/asr_confidence_utils.py:28:0: C0115: Missing class docstring (missing-class-docstring)
nemo/collections/asr/parts/utils/asr_confidence_utils.py:34:4: C0116: Missing function or method docstring (missing-function-docstring)
nemo/collections/asr/parts/utils/asr_confidence_utils.py:42:0: C0115: Missing class docstring (missing-class-docstring)
nemo/collections/asr/parts/utils/asr_confidence_utils.py:46:4: C0116: Missing function or method docstring (missing-function-docstring)
nemo/collections/asr/parts/utils/asr_confidence_utils.py:25:0: W0611: Unused logging imported from nemo.utils (unused-import)

-----------------------------------
Your code has been rated at 9.79/10
```

---

Thank you for improving NeMo's documentation!
# What does this PR do ?

Adds greedy confidence estimation for AED multitask models

**Collection**: [ASR]

# Changelog 
- Add specific line by line info of high level changes in this PR.

# Usage
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```python
# Add a code snippet demonstrating how to use this 
```

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