Add adapter

[xinyual]

Description

add adapter and bias-finetune to finetune-script

Checklist

Essentials

• [ ] PR's title starts with a category (e.g. [BUGFIX], [MODEL], [TUTORIAL], [FEATURE], [DOC], etc)
• [ ] Changes are complete (i.e. I finished coding on this PR)
• [ ] All changes have test coverage
• [ ] Code is well-documented

Changes

• [ ] Feature1, tests, (and when applicable, API doc)
• [ ] Feature2, tests, (and when applicable, API doc)

Comments

• If this change is a backward incompatible change, why must this change be made.
• Interesting edge cases to note here

cc @dmlc/gluon-nlp-team

[codecov[bot]]

Codecov Report

Merging #1545 (43327de) into master (1326258) will decrease coverage by 0.71%. The diff coverage is 78.94%.

:exclamation: Current head 43327de differs from pull request most recent head e25bcb3. Consider uploading reports for the commit e25bcb3 to get more accurate results

@@            Coverage Diff             @@
##           master    #1545      +/-   ##
==========================================
- Coverage   82.20%   81.48%   -0.72%     
==========================================
  Files          68       68              
  Lines        8540     8432     -108     
==========================================
- Hits         7020     6871     -149     
- Misses       1520     1561      +41     

Impacted Files	Coverage Δ
src/gluonnlp/layers.py	86.72% <ø> (ø)
src/gluonnlp/models/transformer.py	97.89% <70.00%> (-0.64%)	:arrow_down:
src/gluonnlp/models/bert.py	94.42% <88.88%> (-0.39%)	:arrow_down:
conftest.py	76.31% <0.00%> (-9.94%)	:arrow_down:
src/gluonnlp/data/loading.py	76.55% <0.00%> (-7.39%)	:arrow_down:
src/gluonnlp/data/filtering.py	78.26% <0.00%> (-4.35%)	:arrow_down:
src/gluonnlp/utils/lazy_imports.py	58.42% <0.00%> (-2.25%)	:arrow_down:
src/gluonnlp/data/tokenizers/yttm.py	81.73% <0.00%> (-1.02%)	:arrow_down:
src/gluonnlp/torch/models/transformer.py	27.23% <0.00%> (-0.92%)	:arrow_down:
src/gluonnlp/data/tokenizers/spacy.py	65.33% <0.00%> (-0.91%)	:arrow_down:
... and 24 more

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