fix(transformers): check for task aliases

[jeffthebear]

Bug Fix: add task aliases of transformers pipeline supported tasks

What does this PR address?

I ran into an issue today trying to load a Huggingface pipeline after it was saved via:

nlp = pipeline('ner', model=model, tokenizer=tokenizer)
bentoml.transformers.save_model(name="ner", pipeline=nlp)
runner = bentoml.transformers.get("ner:latest").to_runner()  # fails here

The "ner" task is one of the [TASK_ALIASES](https://github.com/huggingface/transformers/blob/main/src/transformers/pipelines/__init__.py#L150) in transformers pipeline which maps to a SUPPORTED_TASK. Funny thing is save_model() has TASK_ALIASES support but maybe it was forgotten in load_model().

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[codecov]

Codecov Report

Merging #3337 (6aa0442) into main (d7254c0) will decrease coverage by 0.00%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##             main    #3337      +/-   ##
==========================================
- Coverage   33.12%   33.12%   -0.01%     
==========================================
  Files         132      132              
  Lines       10626    10627       +1     
  Branches     1776     1776              
==========================================
  Hits         3520     3520              
- Misses       6869     6870       +1     
  Partials      237      237              

Impacted Files	Coverage Δ
src/bentoml/_internal/frameworks/transformers.py	0.00% <0.00%> (ø)

[aarnphm]

LGTM