[WIP] [MODEL] Add DRMM for text matching

[fierceX]

Description

Build an "Deep Relevance Matching Model"
https://github.com/dmlc/gluon-nlp/issues/654#issuecomment-489500257

The original data was not tested because the data set in the original paper was not found.

Checklist

Essentials

• [x] 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

[codecov[bot]]

Codecov Report

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[codecov[bot]]

Codecov Report

:exclamation: No coverage uploaded for pull request head (drmm@910ddf8). Click here to learn what that means. The diff coverage is n/a.

[mli]

Job PR-785/1 is complete. Docs are uploaded to http://gluon-nlp-staging.s3-accelerate.dualstack.amazonaws.com/PR-785/1/index.html

[mli]

Job PR-785/2 is complete. Docs are uploaded to http://gluon-nlp-staging.s3-accelerate.dualstack.amazonaws.com/PR-785/2/index.html

[mli]

Job PR-785/3 is complete. Docs are uploaded to http://gluon-nlp-staging.s3-accelerate.dualstack.amazonaws.com/PR-785/3/index.html